The Best of Open Source

A hand-picked directory of standout open source projects — the ones that actually move the needle. Curated from GitHub awesome-lists, opensourceprojects.dev, and the maintainers we trust.

104 projects 9 categories Refreshed September 11, 2026 · Next Expected September 12, 2026

🆕 New from libhunt (20)

The 20 most-mentioned open-source projects on libhunt.com right now. Refreshed daily.

ontoplano ★ 5

Managing life, one week at a time. (5 mentions)

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CodeBehind is a modern and revolutionary full-stack framework built on ASP.NET Core. (143 mentions)

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Agentic_RAG ★ 6

This repository demonstrate how to use agents in RAG (6 mentions)

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Practical MuleSoft recipes — 100+ DataWeave patterns, AI agent integration, CI/CD pipelines, migration guides, and more. (7 mentions)

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Your AI's guard dog. Doberman sits at runtime, gating every input, output and tool call to stop unsafe or unintended actions before they execute. (6 mentions)

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checker ★ 5

Effortless input validation in Go with the power of struct tags. No dependencies, just pure simplicity. ✨ See how! 👀 (5 mentions)

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Lean certificates accompanying Navier-Stokes and Euler results (5 mentions)

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Flash ★ 7

An AI-powered command-line interface that bridges natural language and shell execution. (7 mentions)

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Codename One ★ 169

Open-source framework for native apps from one Java codebase, with a custom-rendered UI you control across iOS, Android, desktop, web, and watches. (169 mentions)

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zstd ★ 128

Zstandard - Fast real-time compression algorithm (128 mentions)

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Grant radar for small NGOs: Gemini Search grounding finds currently-open grants, then every application URL is independently checked before you see it. (5 mentions)

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spec-kit ★ 84

💫 Toolkit to help you get started with Spec-Driven Development (84 mentions)

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worlds via code, from fable 5.1 (5 mentions)

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Local evidence debugger and trajectory-test toolkit for TypeScript AI agents: inspect causal runs, catch wrong tool paths in CI, and share safe offline evidence. (8 mentions)

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Grafana ★ 485

The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more. (485 mentions)

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list ★ 79

The Public Suffix List (79 mentions)

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:shipit: Adds realtime chat for ChatGPT Voice Mode [Unofficial] (111 mentions)

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The Apify MCP server enables your AI agents to extract data from social media, search engines, maps, e-commerce sites, or any other website using thousands of ready-made scrapers, crawlers, and automation tools available on the Apify Store. (10 mentions)

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jj ★ 85

A Git-compatible VCS that is both simple and powerful (85 mentions)

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Developer Tools (12)

Zed ★ 90.1k

Code at the speed of thought. Zed is a high-performance, multiplayer code editor written in Rust, leveraging GPU rendering. Built by the creators of Atom. Macros, multi-cursor, and collaboration built in.

Why we picked it: What VS Code would be if it were built today: GPU-rendered, Rust-fast, and collaboration-native. The most exciting new editor in years.
★ GOLD★ 2 sourcesNOASSERTIONRusteditorrustcollaborationperformance
Lazygit ★ 82.2k

A simple terminal UI for git commands. Stage hunks, resolve conflicts, manage branches, push to remotes — all from one TUI. The single best tool for 'I hate the command line, but I also hate GUI git clients.'

Why we picked it: TUI for git that's faster than any GUI. Once you try it, every other git workflow feels broken.
★ GOLDMITGogittuiterminalworkflow
fzf ★ 82.9k

A command-line fuzzy finder written in Go. Pipe any list to fzf, get an interactive search UI. The swiss-army knife of CLI workflows: find files, history, branches, processes, anything.

Why we picked it: Fuzzy find anything. The single most-installed CLI utility among senior engineers.
★ GOLD★ 2 sourcesMITGosearchclifuzzyproductivity
Helix ★ 46.2k

Post-modern terminal text editor. Tree-sitter syntax highlighting, LSP out of the box, modal editing without the Vimscript. A serious competitor to Neovim that's far easier to pick up.

Why we picked it: The default for people who want modal editing and LSP but refuse to write a vimrc. Comes configured; learn the keybinds, not the plugin system.
★ SILVERMPL-2.0Rusteditorterminalrusttree-sitterlsp
tmux ★ 49.2k

Terminal multiplexer. Detach sessions, split panes, script everything. The bedrock of any serious terminal workflow.

Why we picked it: Every remote SSH session, every long-running dev server, every pair-programming demo. The tool you forget exists until you don't have it.
★ SILVER★ 2 sourcesISCCterminalmultiplexercli
Btop ★ 34.5k

A modern, beautiful resource monitor for the terminal. Replaces top/htop/atop with a clean TUI that shows CPU, memory, network, disks, and processes at a glance.

Why we picked it: The prettiest system monitor you'll ever install. GPU support, mouse interaction, themes. Drop-in replacement for htop with vastly more signal.
★ SILVERApache-2.0C++terminalmonitortuisystem
delta ★ 32.1k

A syntax-highlighting pager for git, diff, and grep output. Side-by-side diff, line numbers, language-aware highlighting, and a configurable theme system.

Why we picked it: The single biggest readability upgrade you can make to your git workflow. Once you use it, plain `git diff` looks broken.
★ SILVERMITRustgitdiffterminalcli
act ★ 71.9k

Run your GitHub Actions locally. Test workflows before pushing, debug failed runs in seconds instead of minutes.

Why we picked it: Stop the 'commit, push, wait for CI, find out it failed' loop. Run the workflow locally with one command.
★ GOLDMITGocigithub-actionsdockerdevops
mise ★ 33.8k

A polyglot tool version manager. Replaces asdf, nvm, pyenv, rbenv, and gvm with one fast, Rust-based tool. Per-project versions via .mise.toml.

Why we picked it: One config file replaces five version managers. Cleaner, faster, and works the way you actually use it.
★ SILVERMITRusttoolchainversion-managerpolyglotrust
Atuin ★ 31.6k

Replaces your shell history with a searchable, encrypted, synchronized database. Fuzzy-find any command you've ever run across all your machines.

Why we picked it: The shell history you actually want. Search, context (exit code, time, host), sync across machines, and end-to-end encryption.
★ SILVERMITRustshellhistorycliproductivity
Lazydocker ★ 52.8k

Terminal UI for Docker and Docker Compose. View containers, view logs, restart, exec, prune — without remembering docker CLI flags.

Why we picked it: The lazygit of Docker. A TUI that surfaces the things you need and hides the things you don't. The kind of tool you wonder how you lived without.
★ GOLDMITGodockerterminaltuidevops
httpie ★ 38.5k

A user-friendly command-line HTTP client. JSON highlighting, intuitive syntax, persistent sessions, plugin support. The replacement for curl you actually want to use.

Why we picked it: Built-in JSON formatting, easy headers and bodies, and a UI mode for exploring APIs interactively. The right tool for ad-hoc API work.
★ SILVER★ 2 sourcesBSD-3-ClausePythonhttpcliapicurl

AI & Machine Learning (10)

ComfyUI ★ 132.5k

The most powerful and modular stable diffusion GUI and backend. Node-based workflow editor for image generation, inpainting, ControlNet, video, and more. Used by professional AI artists and researchers.

Why we picked it: The professional's choice for AI image generation. Node-based workflow beats every other UI.
★ GOLDGPL-3.0Pythonai-artstable-diffusionworkflowgenerative
LangChain ★ 146.1k

Build context-aware reasoning applications. Compose chains, agents, and retrieval pipelines over any LLM. The de-facto framework for production AI applications — both loved and criticized, but unavoidable.

Why we picked it: The framework that defined 'AI engineering.' Still the most-used way to build production LLM apps, despite the noise.
★ GOLD★ 2 sourcesMITPythonllmagentsragframework
vLLM ★ 91.5k

High-throughput, memory-efficient inference engine for LLMs. PagedAttention, continuous batching, and OpenAI-compatible serving.

Why we picked it: The default LLM serving engine. If you're deploying a model and you don't have a strong reason to pick something else, use vLLM.
★ GOLD★ 3 sourcesApache-2.0Pythonllminferenceservinggpu
llama.cpp ★ 127.8k

Run large language models locally on consumer hardware. The reference implementation of GGUF quantization, used by Ollama, LM Studio, and most local-LLM tools.

Why we picked it: The bedrock of local LLM. Runs 70B models on a Macbook, 7B models on a Raspberry Pi. Every other local-LLM tool builds on top of this.
★ GOLD★ 2 sourcesMITC++llminferencequantizationlocal

A polished fork of the A1111 WebUI optimized for lower VRAM. Runs the same models, the same extensions, but with significant memory and speed improvements.

Why we picked it: The A1111 experience with modern performance. If A1111 ran too hot on your GPU, this is the fork to install.
★ SILVERAGPL-3.0Pythonimage-generationstable-diffusionui
Open WebUI ★ 151.6k

A polished, feature-rich web interface for LLMs. Works with Ollama and any OpenAI-compatible API. Chat, RAG, image generation, multi-user, and a strong plugin ecosystem.

Why we picked it: The ChatGPT-like local UI that ships with the features you'd actually use. RAG, web search, voice, image generation — all built in.
★ GOLDNOASSERTIONPythonchat-uillmollamarag
WhisperX ★ 24.0k

Fast automatic speech recognition with word-level timestamps and speaker diarization. Built on Whisper with VAD-based segmentation and forced alignment.

Why we picked it: The transcription pipeline used by serious podcast and video teams. Word-level timestamps and speaker labels that Whisper alone doesn't give you.
★ SILVERBSD-2-ClausePythonspeech-to-texttranscriptiondiarization

State-of-the-art open text-to-image models. FLUX.1 from Black Forest Labs matches or beats closed-source models on prompt adherence and typography.

Why we picked it: The first open model that genuinely rivals Midjourney on prompt adherence and renders text correctly. Run it via ComfyUI or diffusers.
★ SILVERApache-2.0Pythonimage-generationtext-to-imageflux
Dify ★ 155.4k

An open-source platform for building LLM applications. Visual workflow builder, RAG, agent orchestration, and one-click deployment.

Why we picked it: The LangChain alternative with a real UI. Build, test, and deploy LLM apps without writing 500 lines of glue code.
★ GOLDNOASSERTIONTypeScriptllmragagentno-code
RAGFlow ★ 90.5k

An open-source RAG engine with deep document understanding. Multi-modal extraction, graph-based chunking, and grounded citations on every answer.

Why we picked it: The RAG system that gives you real citations and handles messy real-world documents. Beats naive vector-search approaches for almost every enterprise use case.
★ GOLDApache-2.0Goragllmdocument-ai

Productivity & Notes (9)

Syncthing ★ 88.5k

Continuous file synchronization. Sync files between devices without a central server. End-to-end encrypted, peer-to-peer, and works on everything. The DropBox replacement that doesn't need the cloud.

Why we picked it: DropBox without the cloud. P2P file sync, end-to-end encrypted, no account required.
★ GOLDMPL-2.0Gosyncp2pbackupself-hosted
Anki ★ 30.5k

Spaced-repetition flashcard system. The original SRS app, still the best. Sync across devices, plugin ecosystem, and a community-built shared deck library.

Why we picked it: The reference implementation of spaced repetition. Free, runs on every device, and 10+ years of community decks. The default for med students and language learners.
★ SILVERNOASSERTIONRustsrslearningflashcardseducation
Zotero ★ 15.2k

A free, open-source reference manager. Capture sources from the web, organize with tags and collections, cite in Word/LibreOffice with one click.

Why we picked it: The academic reference manager. Free, open, syncs across devices, and has the best web clipper of any tool in this space.
★ SILVERNOASSERTIONJavaScriptresearchcitationsacademicpdf
HedgeDoc ★ 7.4k

Self-hosted collaborative markdown editor. Real-time multi-user editing, draw.io integration, slide mode, and rich export options.

Why we picked it: The HackMD alternative you can run on your own server. Best for team documentation, meeting notes, and quick shared drafts.
★ SILVERAGPL-3.0TypeScriptmarkdowncollabwikieditor
Trilium ★ 12.0k

Hierarchical note-taking with a focus on personal knowledge management. Notes can contain notes, scripts, and widgets. Endlessly extensible.

Why we picked it: The 'build your own second brain' tool. Most flexible PKM app on the market — if you can think of a note structure, Trilium can express it.
★ SILVERAGPL-3.0JavaScriptnotesknowledge-basepkmhierarchical
BookStack ★ 19.0k

A simple, self-hosted wiki platform. Books → Chapters → Pages. Built for documentation, internal knowledge bases, and team handbooks.

Why we picked it: The wiki tool for people who don't want a wiki tool. Ships with everything you need, the UI is intuitive, and the upgrade path is gentle.
★ SILVERMITPHPwikidocsself-hostedknowledge-base
Outline ★ 40.5k

A fast, collaborative knowledge base for your team. Built on React and Node, with markdown editing, real-time collab, and a polished search.

Why we picked it: The Notion alternative that takes 30 seconds to set up and stays fast at 10,000 pages. Best for team docs where you want Notion's UX without its weight.
★ SILVERNOASSERTIONTypeScriptwikiteamcollabknowledge-base
Espanso ★ 14.5k

A cross-platform text expander. Type a short abbreviation, get a long snippet. Works in every app on your system.

Why we picked it: The productivity hack that pays for itself in a week. Code snippets, email templates, addresses, common responses. Set it up once, benefit for years.
★ SILVERGPL-3.0Rustproductivitytext-expandercli
Thunderbird ★ 11.0k

A free email client from Mozilla. Local-first, strong privacy, OpenPGP built in, and a strong extension ecosystem.

Why we picked it: The email client that respects you. No telemetry by default, works with any provider, and the new Supersonic UI is fast enough for power users.
★ SILVERMPL-2.0Rustemailclientprivacycalendar

Office Suite (2)

Collabora Online ★ 3.3k

LibreOffice Online — the commercial cloud version of LibreOffice, packaged for self-hosting. Integrates directly into Nextcloud, OwnCloud, and Seafile. Best-in-class docx/xlsx/pptx rendering for the LibreOffice ecosystem.

Why we picked it: The self-hostable office suite with the best LibreOffice docx fidelity. Pairs with Nextcloud for the full Google Workspace replacement.
★ SILVERNOASSERTIONShellofficelibreofficecollaborativenextcloudself-hosted
CryptPad ★ 6.8k

End-to-end encrypted collaborative office suite. Documents, sheets, slides, kanban, code, forms. Zero-knowledge encryption means even the server admin can't read your docs. The privacy-first alternative to Google Docs.

Why we picked it: The privacy-first Google Docs alternative. End-to-end encrypted — even CryptPad's own servers can't read your documents.
★ GOLDAGPL-3.0JavaScriptofficeencryptedcollaborativeprivacye2ee

Infrastructure & DevOps (14)

Docker ★ 72.1k

The container runtime that defined modern DevOps. Build, ship, and run any application as a portable, isolated container. The Moby project is the upstream; Docker is the polished product on top.

Why we picked it: Containers are the lingua franca of cloud software. Docker is the tool that taught everyone the language.
★ GOLD★ 2 sourcesApache-2.0Gocontainersdevopsdeploymentplatform
Kubernetes ★ 127.3k

Production-grade container orchestration. Automates deployment, scaling, and management of containerized applications. The 'operating system' of the cloud — complex, but no real alternative at scale.

Why we picked it: The standard for container orchestration. You don't have to love it. You almost certainly have to learn it.
★ GOLD★ 2 sourcesApache-2.0Goorchestrationcontainersdevopscloud
Caddy ★ 75.6k

The ultimate server with automatic HTTPS. Single binary, zero-config TLS via Let's Encrypt, HTTP/3 by default, and a sane config format. Replaces nginx for almost every use case.

Why we picked it: The web server that does HTTPS for you. Single binary, sane config, no more nginx boilerplate.
★ GOLD★ 2 sourcesApache-2.0Goweb-serverhttpsreverse-proxygo
NixOS ★ 26.1k

A purely functional Linux distribution. Declarative configuration, atomic upgrades, and reproducible builds. Hardest learning curve of any OS, but the only one that solves 'works on my machine' at the system level.

Why we picked it: The only OS where you can roll back a failed system update. The steepest learning curve in this list — and the most rewarding.
★ SILVERMITNixosdeclarativereproduciblefunctional
Gitea ★ 58.0k

A painless, self-hosted Git service. Lighter than GitLab, more featureful than a bare Gitea, written in Go. A community-maintained fork of Gogs with active development and broad package ecosystem.

Why we picked it: Self-hosted GitHub that doesn't need 16GB of RAM. The default self-host choice for small teams.
★ GOLD★ 2 sourcesMITGogitself-hosteddevopsforge
Traefik ★ 64.8k

A modern reverse proxy and load balancer designed for dynamic environments. Auto-discovers services from Docker, Kubernetes, etc.

Why we picked it: The reverse proxy that scales with your stack. Drop it next to your containers and it just figures out your services. Best-in-class Let's Encrypt integration.
★ GOLDMITGoproxydockerkubernetesingress
Pi-hole ★ 60.9k

Network-wide ad blocking via DNS sinkhole. One install protects every device on your network. Runs on a Raspberry Pi.

Why we picked it: The OG network-wide ad blocker. Free, runs on a Pi, and the dashboard is genuinely useful. Every homelab starts here.
★ GOLDNOASSERTIONShelldnsad-blocknetworkself-hosted
Uptime Kuma ★ 91.2k

A self-hosted monitoring tool. HTTP, TCP, ping, DNS, and push monitors. Beautiful UI, status pages, and 80+ notification integrations.

Why we picked it: The monitoring tool you'll actually use. Setup in 5 minutes, status page in another 5, and a notification in every chat platform you can name.
★ GOLDMITJavaScriptmonitoringuptimestatus-pageself-hosted
Headscale ★ 43.7k

An open-source, self-hosted implementation of the Tailscale coordination server. Run your own mesh VPN with full control.

Why we picked it: Tailscale without the central coordination server. Full sovereignty, full Tailscale client compatibility, and no vendor lock-in.
★ SILVERBSD-3-ClauseGovpntailscalemeshself-hosted
Ansible ★ 70.6k

Agentless IT automation. Push-based configuration management, orchestration, and application deployment. YAML-defined playbooks.

Why we picked it: The configuration management tool that doesn't need a server. SSH in, push YAML, move on. Most popular for a reason.
★ GOLD★ 2 sourcesGPL-3.0Pythonautomationconfig-managementdevopsyaml
Terraform ★ 49.6k

Infrastructure as code. Declarative configuration files, a state engine, and a vast provider ecosystem for every cloud and SaaS.

Why we picked it: The de facto IaC standard. If you're managing cloud resources, Terraform is the lingua franca. The BSL license is a real concern for managed-service vendors, not end users.
★ SILVERNOASSERTIONGoiacclouddevopshcl
Woodpecker CI ★ 7.8k

A community-driven fork of Drone CI. Pipeline-as-code for any Git host, with Docker-based execution and an extensible architecture.

Why we picked it: When Drone's future became uncertain, the community forked. Woodpecker is the self-hosted CI that doesn't try to be a SaaS.
★ SILVER★ 2 sourcesApache-2.0Gocipipelinedockerself-hosted
Authentik ★ 25.4k

A self-hosted identity provider with OAuth2, OIDC, SAML, LDAP, and proxy providers. Replaces Auth0, Keycloak, and the duct-tape alternative.

Why we picked it: The identity provider that makes SSO feel like a feature, not a project. UI is good, integration catalog is huge, and the docs are actually good.
★ SILVERNOASSERTIONPythonauthssooauthself-hosted
Coolify ★ 61.7k

A self-hostable Heroku / Netlify / Vercel alternative. Deploy apps, databases, and services from a single dashboard.

Why we picked it: The 'give me Heroku on my own server' answer. Git push, get a URL. The closest thing to a PaaS that respects your sovereignty.
★ GOLDApache-2.0PHPpaasself-hosteddeploydocker

Security & Privacy (12)

Vaultwarden ★ 67.2k

Unofficial Bitwarden-compatible server written in Rust. 100x smaller and faster than upstream Bitwarden, but fully compatible with all official clients. Self-host your password manager in 50MB of RAM.

Why we picked it: The password manager self-hosting world runs on this. Bitwarden-compatible, but 1/100th the resources.
★ GOLDAGPL-3.0Rustpasswordsself-hostedrustbitwarden
Bitwarden ★ 20.1k

Open-source password manager for individuals, teams, and enterprises. End-to-end encrypted, with apps for every platform. The serious alternative to LastPass after LastPass's breach.

Why we picked it: The password manager that proved open source can win a consumer market. End-to-end encrypted, audited, and the de-facto standard after LastPass.
★ SILVERNOASSERTIONC#passwordsencryptionteamssaas
WireGuard ★ 2.3k

An extremely simple yet fast and modern VPN that utilizes state-of-the-art cryptography. Intended to be faster, simpler, leaner, and more useful than IPsec, while avoiding the massive attack surface of OpenVPN.

Why we picked it: The VPN protocol that Linux ships in the kernel. Faster, simpler, and more auditable than OpenVPN.
★ BRONZEGPL-2.0Cvpnnetworkingcryptokernel
Tailscale ★ 36.4k

Zero-config VPN built on WireGuard. Connect devices, laptops, and servers into a private network with no firewall config. The personal VPN that just works — for free, for personal use.

Why we picked it: The 'magic' VPN. Mesh networking with zero firewall config, built on WireGuard. Free for personal use.
★ SILVER★ 2 sourcesBSD-3-ClauseGovpnmeshnetworkingwireguard
Bitwarden Clients ★ 13.8k

The Bitwarden client apps — browser, desktop, mobile, CLI. End-to-end encrypted, with self-hosting via Vaultwarden.

Why we picked it: The clients that make Bitwarden the password manager you actually want to use. Polished, cross-platform, with a free tier that's genuinely useful.
★ SILVERNOASSERTIONTypeScriptpassword-managere2eevault
Authelia ★ 28.9k

A self-hosted single sign-on and 2FA portal. Sits in front of your self-hosted apps and adds a second factor.

Why we picked it: The 2FA front gate. Drop it in front of any app that doesn't have its own, get consistent 2FA across your self-hosted stack.
★ SILVERApache-2.0Goauth2fassoself-hosted
CrowdSec ★ 14.8k

A modern, collaborative intrusion prevention system. Behavior-based detection, shared blocklists, and a unified console.

Why we picked it: The fail2ban successor. Better detection, shared blocklists, and a console that actually tells you what's happening. The community blocklist is the killer feature.
★ SILVERMITGosecurityfail2banidsself-hosted
OpenSnitch ★ 14.1k

An interactive application-level firewall for Linux. Like Little Snitch on macOS, but for Linux. Rule-based, GUI, and per-process.

Why we picked it: The application firewall Linux didn't have. See every connection every app makes, allow or deny, scope rules. The kind of tool that makes you paranoid in a good way.
★ SILVERGPL-3.0Pythonfirewalllinuxnetworkapplication
Wireshark ★ 9.9k

The world's foremost network protocol analyzer. Capture, decode, and analyze traffic across hundreds of protocols.

Why we picked it: The tool you reach for when you need to know what your network is actually doing. Decades of protocol dissectors, the de facto standard.
★ SILVERGPL-2.0Cnetworkanalysisdebugprotocol
CryptPad ★ 7.9k

An end-to-end encrypted collaborative office suite. Docs, sheets, slides, kanban, code, and more — all encrypted in the browser.

Why we picked it: The encrypted Google Docs alternative. Real-time collab, full office app suite, and the encryption is real — even CryptPad's staff can't read your stuff.
★ SILVERAGPL-3.0JavaScripte2eecollabofficeprivacy
Step CA ★ 8.9k

A private certificate authority for your infrastructure. ACME-compatible, strong defaults, easy to operate.

Why we picked it: The CA that should be in every self-hosted stack. Internal services deserve real certs, and Step CA makes them free and easy.
★ SILVERApache-2.0Gopkitlsacmeca
Gitleaks ★ 29.2k

Audit git repositories for secrets, API keys, and credentials. Run in pre-commit hooks, CI, or as a one-shot scanner.

Why we picked it: The secret scanner that actually catches what others miss. Pre-commit hook, CI integration, and a real maintainer who fixes false positives quickly.
★ SILVERMITGosecretsscannerpre-commitci

Communication & Collaboration (11)

Mattermost ★ 39.0k

Open-source, self-hostable Slack alternative. Channels, threads, integrations, voice, and enterprise compliance features. The choice of DevOps and security teams who can't use SaaS chat.

Why we picked it: The Slack alternative you can run on your own hardware. Used by NASA, the US Army, and half the FOSS world.
★ SILVERNOASSERTIONTypeScriptchatslack-alternativeself-hostedteams
Element (Matrix) ★ 13.4k

Secure, decentralized messenger built on the Matrix protocol. End-to-end encrypted by default, with bridges to Slack/Discord/Telegram/iMessage. The future of federated chat.

Why we picked it: The federated, end-to-end encrypted chat client. Matrix protocol is the future of interop messaging.
★ SILVERAGPL-3.0TypeScriptchatmatrixe2eefederated
Jitsi Meet ★ 29.9k

Secure, fully featured, and completely free video conferencing. No account needed, no installation required, browser-based. Self-hostable, with end-to-end encryption support.

Why we picked it: The Zoom replacement that doesn't require an account. Browser-based, self-hostable, and free forever.
★ SILVERApache-2.0TypeScriptvideoconferencingself-hostedwebrtc
Signal Server ★ 10.7k

The reference server implementation for the Signal messaging protocol. End-to-end encrypted, metadata-minimized.

Why we picked it: The protocol that WhatsApp, Messenger, and Google Messages all quietly adopted. The reference implementation is here.
★ SILVERAGPL-3.0Javamessaginge2eeprivacysignal
Mumble ★ 8.3k

Low-latency, high-quality voice chat. Positional audio, low CPU usage, self-hostable. The original VoIP for gamers.

Why we picked it: Low CPU, high quality, positional audio. The Discord alternative for people who care about latency and self-hosting.
★ SILVERNOASSERTIONC++voipvoice-chatgamingself-hosted
Rocket.Chat ★ 46.1k

A self-hostable team chat platform. Channels, DMs, threads, file sharing, voice, video, and a marketplace of apps.

Why we picked it: The Slack alternative you can host yourself. Voice, video, threads, marketplace, mobile apps — most of the Slack surface area, none of the lock-in.
★ SILVERNOASSERTIONTypeScriptchatteamself-hostedcollab
Zulip ★ 25.9k

A threaded team chat built for organized discussion. Topic-based threading that actually scales, with strong keyboard shortcuts.

Why we picked it: The chat tool for teams that have real discussions. Topic-based threads scale where Slack channels drown. Best for engineering, research, and policy teams.
★ SILVERApache-2.0Pythonchatteamthreadedself-hosted
Jami ★ 3.5k

A peer-to-peer, end-to-end encrypted communication platform. Messaging, voice, video, file transfer — no central server.

Why we picked it: The fully distributed communication tool. No servers, no accounts, no metadata. P2P voice/video that actually works on real networks.
★ BRONZEGPL-3.0C++p2pe2eemessagingvideo
PeerTube ★ 15.3k

A federated, ActivityPub-powered video hosting platform. The YouTube alternative built on the fediverse.

Why we picked it: The federated YouTube. Each instance is independent, but videos can be remixed across the network. The best answer to centralized video.
★ SILVERAGPL-3.0TypeScriptvideofederatedfediverseyoutube
Nostr ★ 12.0k

A simple, open protocol for decentralized social. Public-key-based identities, no servers, censorship-resistant by design.

Why we picked it: The protocol behind a wave of censorship-resistant social apps. The simplest, most resilient fediverse implementation.
★ SILVERMITVarioussocialprotocolfederatedcensorship-resistant
Briar ★ 99

An end-to-end encrypted messenger that works over Tor, Wi-Fi, or Bluetooth. Designed for activists and journalists in censored regions.

Why we picked it: The messenger for when the internet is unreliable or hostile. Mesh networking, Tor, Bluetooth. The most security-focused messenger that exists.
AGPL-3.0Kotlinmessaginge2eetoractivist

Design & Creative (10)

Penpot ★ 59.9k

The open-source design and prototyping platform. Self-hostable Figma alternative with real CSS export, design tokens, and full SVG fidelity. Used by Mozilla, the EU, and design teams who can't use Figma.

Why we picked it: The only Figma alternative that's actually self-hostable. Exports real CSS and SVG, not proprietary formats.
★ SILVERMPL-2.0Clojuredesignfigmaprototypingself-hosted
Blender ★ 20.2k

3D creation suite — modeling, rigging, animation, simulation, rendering, compositing, motion tracking, and video editing. The default choice for indie 3D artists, studios, and feature films.

Why we picked it: Hollywood-grade 3D software that costs nothing. The default for indie animation, VFX, and game asset creation.
★ SILVERNOASSERTIONC++3danimationvfxrendering
GIMP ★ 6.4k

GNU Image Manipulation Program. The free, open-source image editor. Raster graphics, scripting, plugins, and a 25-year feature set. Photoshop alternative that doesn't lock you in.

Why we picked it: The image editor that doesn't lock your PSDs. Slower to learn than Photoshop, free forever once you do.
★ SILVERNOASSERTIONCimagephotorastereditor

Open-source design and prototyping. Figma's open counterpart with real-time collab, design tokens, and self-hosting.

Why we picked it: The design tool that doesn't lock your files behind a subscription. Figma-compatible, real-time collab, runs on your own server.
★ SILVERMPL-2.0Clojuredesignuiprototypingcollab
Kdenlive ★ 5.7k

A professional-grade, non-linear video editor. Multi-track timeline, effects, transitions, proxy editing, and a render queue.

Why we picked it: The only open video editor trusted for real projects. 20 years of development, mature plugin ecosystem, runs on Linux/Mac/Windows.
★ SILVERGPL-3.0C++videoeditornon-linearkde
Audacity ★ 18.4k

The long-running audio editor. Record, edit, mix, apply effects, export to any format. The de facto free audio tool.

Why we picked it: The audio editor that won't die. Multitrack, noise reduction, VST support, podcast workflow. Used by millions for two decades.
★ SILVERNOASSERTIONC++audioeditorrecordingpodcast
Darktable ★ 13.0k

An open-source photography workflow application and raw developer. Non-destructive editing, tethered capture, and powerful color grading.

Why we picked it: The Lightroom alternative. Free, non-destructive, runs on Linux, and the color science is serious. Best free tool for raw photography.
★ SILVERGPL-3.0Cphotographyrawdarkroomediting
RawTherapee ★ 4.2k

A powerful raw photo processing program. Non-destructive editing, advanced demosaicing, and fine-grained color control.

Why we picked it: The demosaicing and color science are top-tier. If you shoot raw and care about every pixel, RawTherapee is worth the steeper learning curve.
★ BRONZEGPL-3.0C++photographyraweditingcolor
LMMS ★ 10.4k

A free, cross-platform digital audio workstation. Beat/bassline editor, piano roll, VST support, and a built-in library of sounds.

Why we picked it: The FL Studio alternative. Beat-making, full mixing, VST support, and a long-standing community. Free for everyone who wants to make music.
★ SILVERGPL-2.0C++dawmusicaudioproduction
Krita ★ 10.3k

A professional painting and sketching program. Brush engine, animation tools, comic-book templates, and a strong artist community.

Why we picked it: The digital painting tool that doesn't cost $50/month. Brush engine rivals Photoshop, animation tools are real, and the comic-book workflow is unique.
★ SILVERGPL-3.0C++paintingillustrationanimationdrawing

Money & Business (11)

Actual Budget ★ 28.7k

A local-first personal finance app. Envelope budgeting, multi-currency, end-to-end encrypted sync. The YNAB alternative for people who want their data on their own hardware.

Why we picked it: YNAB costs $99/year. Actual is free, local-first, and end-to-end encrypted. The budgeting app that respects your data.
★ SILVERMITTypeScriptfinancebudgetinglocal-firstenvelope
Ghost ★ 55.3k

Powerful, modern publishing platform. Used by Apple, NASA, and millions of writers. Self-hostable, with a built-in newsletter, memberships, and modern JavaScript architecture.

Why we picked it: The publishing platform serious writers choose. Self-hostable, has built-in newsletters, and a modern stack.
★ GOLDMITTypeScriptcmsblognewsletterpublishing
Plane ★ 59.2k

Open-source project management. Issues, cycles, modules, and views. The JIRA alternative for small teams who don't need to pay Atlassian's tax. Self-hostable, fast, and opinionated.

Why we picked it: The JIRA alternative that engineers actually like. Self-hostable, fast, and doesn't try to be a workflow religion.
★ GOLDAGPL-3.0TypeScriptpmjiraissuesself-hosted
Directus ★ 37.9k

Open-source data platform — headless CMS, backend-for-frontend, and data layer for any SQL database. Wrap your existing Postgres or MySQL with a powerful admin UI and instant APIs.

Why we picked it: The headless CMS that wraps your existing SQL database. No migration, no lock-in — just an admin UI and instant APIs over what you already have.
★ SILVERNOASSERTIONTypeScriptcmsheadlessdatabaseapi
ERPNext ★ 39.1k

A full-featured ERP for SMEs. Accounting, inventory, manufacturing, CRM, HR — all integrated, all open.

Why we picked it: The most complete open ERP. If you're tired of QuickBooks for accounting AND a separate CRM AND a separate inventory tool, ERPNext is one place for all of it.
★ SILVERGPL-3.0Pythonerpaccountingbusinessself-hosted
Odoo Community ★ 54.3k

A suite of open-source business apps. CRM, e-commerce, accounting, inventory, manufacturing — modular, integrated.

Why we picked it: The most-installed open ERP. Pick only the apps you need, pay only for the apps you scale. The most flexible business suite on the market.
★ GOLD★ 2 sourcesNOASSERTIONPythonerpcrmbusinessself-hosted
EspoCRM ★ 3.3k

A flexible, lightweight CRM. Sales pipeline, contacts, calendar, tasks, marketing campaigns, and a rich extension marketplace.

Why we picked it: The CRM that doesn't try to do everything. Clean, fast, extensible, and self-hostable. For teams that find Salesforce overwhelming and HubSpot too expensive.
★ BRONZEAGPL-3.0PHPcrmsalesbusinessself-hosted
Akaunting ★ 10.1k

A free, online accounting software for small businesses. Invoicing, expenses, reports, multi-currency, and a strong app marketplace.

Why we picked it: The free Wave / Xero alternative. Self-hostable, multi-currency, with an app marketplace for payroll, inventory, etc. The right answer for the SMB that outgrew spreadsheets.
★ SILVERNOASSERTIONPHPaccountinginvoicingbooksself-hosted
InvoicePlane ★ 3.1k

A self-hosted invoicing and client management app. Quotes, invoices, payments, clients, and reports.

Why we picked it: The focused invoicing app. If you don't need an ERP, just need to send invoices and track payments, InvoicePlane does it cleanly.
★ BRONZENOASSERTIONPHPinvoicingbillingself-hosted
Kimai ★ 5.0k

A self-hosted time-tracking app. Projects, customers, tasks, JSON/CSV export, and rich reporting. Multi-user with roles.

Why we picked it: The time tracker for freelancers and small teams. Self-hostable, clean UI, exports to every billing system. Drop-in replacement for Toggl.
★ BRONZEAGPL-3.0PHPtime-trackingproductivityself-hosted
Mautic ★ 10.5k

An open-source marketing automation platform. Email campaigns, lead scoring, landing pages, and multi-channel workflows.

Why we picked it: The HubSpot / Marketo alternative. Free, self-hostable, and has the depth to run real marketing campaigns. The de facto open marketing automation tool.
★ SILVERNOASSERTIONPHPmarketingemailautomationself-hosted

Sources: github awesome-lists· opensourceprojects.dev· libhunt· awesome-python· awesome-go· github topics