Permissive open-source software in 2026

Use it anywhere, including in closed products. You keep the copyright notice; Apache-2.0 also grants patent rights. 1,487 projects here use MIT (899), Apache-2.0 (503), BSD-2-Clause (16), BSD-3-Clause (59), ISC (4), Zlib (3), BSL-1.0 (1), PostgreSQL (1) and UPL-1.0 (1).

1. 1
   React react

   The library for web and native user interfaces.

   Framework or platform Production-ready You build interactive front ends and want the largest ecosystem and hiring pool.

   ★ 252k MIT JavaScript Active, pushed 2 days ago
2. 2
   Ollama ollama

   Get up and running with Kimi, GLM, MiniMax, DeepSeek, gpt-oss, Qwen, Gemma and other models.

   Developer tool Production-ready You want to run local LLMs for development, privacy or offline use with minimal setup.

   ★ 186k MIT Go Active, pushed today
3. 3
   Flutter flutter

   Flutter makes it easy and fast to build beautiful apps for mobile and beyond

   Framework or platform Production-ready You want one team to ship polished apps on mobile and desktop from a shared codebase.

   ★ 181k BSD-3-Clause Dart Active, pushed today
4. 4
   Transformers huggingface

   🤗 Transformers: the model-definition framework for state-of-the-art machine learning models in text, vision, audio, and multimodal models, for both inference and training.

   Framework or platform Production-ready You want to load, run or fine-tune open models from the Hugging Face Hub in Python.

   ★ 168k Apache-2.0 Python Active, pushed today
5. 5
   Next.js vercel

   The React Framework

   Framework or platform Production-ready You build a React web app that needs SEO-friendly rendering and back-end routes in one project.

   ★ 143k MIT JavaScript Active, pushed today
6. 6
   Go golang

   The Go programming language

   Developer tool Production-ready You build backend services or command-line tools and value simple code, fast builds and single-binary deploys.

   ★ 140k BSD-3-Clause Go Active, pushed today
7. 7
   Excalidraw excalidraw

   Virtual whiteboard for sketching hand-drawn like diagrams

   Complete system Production-ready Teams want quick informal diagrams in meetings, docs or your own app without heavyweight diagram tools.

   ★ 135k MIT TypeScript Active, pushed today
8. 8
   Llama.cpp ggml-org

   LLM inference in C/C++

   Building block Production-ready You need efficient local or edge LLM inference and want the engine many other tools are built on.

   ★ 133k MIT C++ Active, pushed today
9. 9
   Electron electron

   :electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS

   Framework or platform Production-ready You want one web codebase to ship desktop apps for Windows, macOS and Linux.

   ★ 124k MIT C++ Active, pushed today
10. 10
    Rust rust-lang

    Empowering everyone to build reliable and efficient software.

    Developer tool Production-ready You need C-level performance with memory safety, for systems software, CLIs, services or WebAssembly.

    ★ 121k Apache-2.0 Rust Active, pushed today
11. 11
    Godot godotengine

    Godot Engine – Multi-platform 2D and 3D game engine

    Framework or platform Production-ready You want a royalty-free engine for 2D games or small to mid-size 3D games.

    ★ 119k MIT C++ Active, pushed today
12. 12
    Three.js mrdoob

    JavaScript 3D Library.

    Building block Production-ready You need 3D graphics, product viewers or visualisations on the web.

    ★ 117k MIT JavaScript Active, pushed today
13. 13
    Supabase supabase

    The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.

    Framework or platform Production-ready You want Firebase-style speed of building but on standard Postgres, hosted or self-hosted.

    ★ 114k Apache-2.0 TypeScript Active, pushed today
14. 14
    Tauri tauri-apps

    Build smaller, faster, and more secure desktop and mobile applications with a web frontend.

    Framework or platform Production-ready You want Electron-style apps with much smaller binaries and lower memory use.

    ★ 112k Apache-2.0 Rust Active, pushed today
15. 15
    TypeScript microsoft

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

    Developer tool Production-ready You write JavaScript projects of any size and want static types and better editor tooling.

    ★ 112k Apache-2.0 Go Active, pushed today
16. 16
    OpenDesign nexu-io

    The 1st Collaborative AI Design Agent Workspace. Local-first and open source. Create motion, prototypes, websites, apps, dashboards, presentations, images, and videos with your team and AI agents. Share work, exchange feedback, and iterate together in one workspace.

    Complete system Experimental A product team wants an open alternative to Claude Design or Figma Make for AI-generated prototypes.

    ★ 106k Apache-2.0 TypeScript Active, pushed today
17. 17
    FastAPI fastapi

    FastAPI framework, high performance, easy to learn, fast to code, ready for production

    Framework or platform Production-ready You build JSON APIs or ML services in Python and want typed, async code with free docs.

    ★ 104k MIT Python Active, pushed today
18. 18
    Angular angular

    Deliver web apps with confidence 🚀

    Framework or platform Production-ready You build large enterprise web apps and want a complete, opinionated framework with long-term support.

    ★ 101k MIT TypeScript Active, pushed today
19. 19
    Tailwindcss tailwindlabs

    A utility-first CSS framework for rapid UI development.

    Framework or platform Production-ready You build UIs in a component framework and want consistent styling without writing custom CSS files.

    ★ 98k MIT TypeScript Active, pushed today
20. 20
    LocalSend localsend

    An open-source cross-platform alternative to AirDrop

    Complete system Production-ready You need AirDrop-style transfers between mixed Windows, macOS, Linux, Android and iOS devices on the same network.

    ★ 97k Apache-2.0 Dart Active, pushed today
21. 21
    vLLM vllm-project

    A high-throughput and memory-efficient inference and serving engine for LLMs

    Building block Production-ready You serve open-weight models to many users on your own GPUs and need throughput.

    ★ 96k Apache-2.0 Python Active, pushed today
22. 22
    Uptime Kuma louislam

    A fancy self-hosted monitoring tool

    Complete system Production-ready You want an easy, UptimeRobot-style monitor on your own server for a homelab or small business.

    ★ 93k MIT JavaScript Active, pushed today
23. 23
    Core home-assistant

    :house_with_garden: Open source home automation that puts local control and privacy first.

    Complete system Production-ready You want local control of a smart home across many brands without relying on vendor clouds.

    ★ 92k Apache-2.0 Python Active, pushed today
24. 24
    PaddleOCR PaddlePaddle

    Turn any PDF or image document into structured data for your AI. A powerful, lightweight OCR toolkit that bridges the gap between images/PDFs and LLMs. Supports 100+ languages.

    Building block Production-ready You need strong OCR, especially for Chinese and Asian scripts, in a document pipeline.

    ★ 92k Apache-2.0 Python Active, pushed 2 months ago
25. 25
    Django django

    The Web framework for perfectionists with deadlines.

    Framework or platform Production-ready You are building a data-driven web app in Python and want batteries included.

    ★ 91k BSD-3-Clause Python Active, pushed today
26. 26
    Hugo gohugoio

    The world’s fastest framework for building websites.

    Developer tool Production-ready You want a fast, dependency-free generator for docs, blogs or marketing sites with thousands of pages.

    ★ 90k Apache-2.0 Go Active, pushed today
27. 27
    Gin gin-gonic

    Gin is a high-performance HTTP web framework written in Go. It provides a Martini-like API but with significantly better performance—up to 40 times faster—thanks to httprouter. Gin is designed for building REST APIs, web applications, and microservices.

    Framework or platform Production-ready You build HTTP APIs in Go and want the most widely used framework with many examples.

    ★ 89k MIT Go Active, pushed 24 days ago
28. 28
    NextChat ChatGPTNextWeb

    ✨ Zero-config AI chat assistant. No API key needed — sign up and instantly chat with GPT-5, Claude 4, Gemini 2.5, DeepSeek & 100+ top models. Pay-as-you-go saves you more. Available on Web, iOS, macOS, Android, Linux, Windows.

    Complete system Usable You want a fast personal chat front end you can deploy to Vercel or run as a desktop app.

    ★ 89k MIT TypeScript Active, pushed 13 days ago
29. 29
    Svelte sveltejs

    web development for the rest of us

    Framework or platform Production-ready You want small bundles and simple component code for a new front end.

    ★ 89k MIT JavaScript Active, pushed today
30. 30
    Vite vitejs

    Next generation frontend tooling. It's fast!

    Developer tool Production-ready You start or modernise a front-end project and want fast builds.

    ★ 84k MIT TypeScript Active, pushed today
31. 31
    Hoppscotch hoppscotch

    Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

    Developer tool Production-ready Your team wants a Postman-like client that it can self-host or use in the browser.

    ★ 81k MIT TypeScript Active, pushed 2 days ago
32. 32
    Tesseract tesseract-ocr

    Tesseract Open Source OCR Engine (main repository)

    Building block Production-ready You need free, offline OCR for reasonably clean printed text.

    ★ 77k Apache-2.0 C++ Active, pushed 5 days ago
33. 33
    Nest nestjs

    A progressive Node.js framework for building efficient, scalable, and enterprise-grade server-side applications with TypeScript/JavaScript 🚀

    Framework or platform Production-ready You build larger Node.js back ends and want Angular-style structure.

    ★ 77k MIT TypeScript Active, pushed today
34. 34
    PhotoCraft storytold

    PhotoCraft: An open-source, photo editor written by scratch in pure Rust

    Complete system Experimental You want to try a native open-source Photoshop-style editor and can accept missing features.

    ★ 76k Apache-2.0 Rust Active, pushed today
35. 35
    Superset apache

    Apache Superset is a Data Visualization and Data Exploration Platform

    Complete system Production-ready A data team wants a free, scalable BI tool and has engineers to deploy and maintain it.

    ★ 75k Apache-2.0 Python Active, pushed yesterday
36. 36
    Flask pallets

    The Python micro framework for building web applications.

    Framework or platform Production-ready You want a minimal Python web framework where you choose your own database and components.

    ★ 75k BSD-3-Clause Python Active, pushed 3 days ago
37. 37
    Swift swiftlang

    The Swift Programming Language

    Developer tool Production-ready You build iOS or macOS apps, or want Swift on Linux servers.

    ★ 71k Apache-2.0 Swift Active, pushed today
38. 38
    Docling docling-project

    Get your documents ready for gen AI

    Building block Production-ready You feed business documents into RAG or LLM workflows and need reliable local parsing.

    ★ 70k MIT Python Active, pushed yesterday
39. 39
    Express expressjs

    Fast, unopinionated, minimalist web framework for node.

    Framework or platform Production-ready You want the most widely known, unopinionated Node.js server framework.

    ★ 70k MIT JavaScript Active, pushed today
40. 40
    AnythingLLM Mintplex-Labs

    Stop renting your intelligence. Own it with AnythingLLM. Everything you need for a powerful local-first agent experience

    Complete system Usable You want private document chat for a small team without building a RAG stack yourself.

    ★ 68k MIT JavaScript Active, pushed today
41. 41
    Prometheus prometheus

    The Prometheus monitoring system and time series database.

    Complete system Production-ready You run services or Kubernetes and need metrics and alerting with the de facto standard toolset.

    ★ 67k Apache-2.0 Go Active, pushed today
42. 42
    Coolify coollabsio

    An open-source, self-hostable PaaS alternative to Vercel, Heroku & Netlify that lets you easily deploy static sites, databases, full-stack applications and 360+ one-click services on your own servers.

    Complete system Production-ready You want push-to-deploy convenience on your own VPS fleet without Kubernetes.

    ★ 66k Apache-2.0 PHP Active, pushed today
43. 43
    Memos usememos

    Memos is an open-source, self-hosted note-taking app that brings your everyday thoughts together in a personal timeline. Your data stays yours, and you choose what to keep private or share.

    Complete system Production-ready You want a quick place to jot thoughts and links on your own server.

    ★ 64k MIT Go Active, pushed today
44. 44
    Socket.IO socketio

    Bidirectional and low-latency communication for every platform

    Building block Production-ready You add chat, live updates or collaboration to a Node.js app.

    ★ 63k MIT TypeScript Active, pushed 34 days ago
45. 45
    Nuxt nuxt

    The full-stack Vue framework.

    Framework or platform Production-ready Your team uses Vue and needs server rendering or a full-stack app.

    ★ 61k MIT TypeScript Active, pushed today
46. 46
    Rclone rclone

    "rsync for cloud storage" - Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Azure Blob, Azure Files, Yandex Files

    Developer tool Production-ready You need to move or back up data between cloud storage services, or script access to them.

    ★ 61k MIT Go Active, pushed today
47. 47
    Rails rails

    Ruby on Rails

    Framework or platform Production-ready A small team wants to build and ship a web product quickly with one cohesive framework.

    ★ 59k MIT Ruby Active, pushed today
48. 48
    Gitea go-gitea

    Git with a cup of tea! Painless self-hosted all-in-one software development service, including Git hosting, code review, team collaboration, package registry and CI/CD

    Complete system Production-ready You want a self-hosted GitHub alternative that runs on a small server with little maintenance.

    ★ 59k MIT Go Active, pushed today
49. 49
    Appwrite appwrite

    The open-source cloud for agents & devs. Including Auth, Databases, Storage, Functions, Messaging, Hosting, Realtime, WAF and more

    Framework or platform Production-ready You are building web or mobile apps and want a Firebase-style backend you can self-host.

    ★ 58k BSD-3-Clause TypeScript Active, pushed today
50. 50
    Gatsby gatsbyjs

    React-based framework with performance, scalability, and security built in.

    Framework or platform Production-ready You maintain an existing Gatsby site; new projects are better served by Astro or Next.js.

    ★ 56k MIT JavaScript Active, pushed 13 days ago
51. 51
    Ghost TryGhost

    Independent technology for modern publishing, memberships, subscriptions and newsletters.

    Complete system Production-ready You publish content and want to run paid memberships or newsletters without taking a platform cut.

    ★ 56k MIT TypeScript Active, pushed today
52. 52
    Core vuejs

    🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

    Framework or platform Production-ready You want an approachable front-end framework that can be adopted gradually in existing pages.

    ★ 55k MIT TypeScript Active, pushed today
53. 53
    Expo expo

    An open-source framework for making universal native apps with React. Expo runs on Android, iOS, and the web.

    Framework or platform Production-ready You build mobile apps in React and want to avoid managing native toolchains yourself.

    ★ 53k MIT TypeScript Active, pushed today
54. 54
    Etcd etcd-io

    Distributed reliable key-value store for the most critical data of a distributed system

    Building block Production-ready You need a small amount of critical coordination data kept consistent across a cluster.

    ★ 52k Apache-2.0 Go Active, pushed today
55. 55
    Jekyll jekyll

    :globe_with_meridians: Jekyll is a blog-aware static site generator in Ruby

    Developer tool Production-ready You want a simple blog or project site on GitHub Pages with the widest theme selection.

    ★ 52k MIT Ruby Active, pushed 20 days ago
56. 56
    ClickHouse ClickHouse

    ClickHouse® is a real-time analytics database management system

    Building block Production-ready You need fast analytics on large append-heavy data such as events, logs or metrics.

    ★ 51k Apache-2.0 C++ Active, pushed today
57. 57
    Pandas pandas-dev

    Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

    Building block Production-ready You analyse spreadsheets, CSVs or database extracts in Python.

    ★ 50k BSD-3-Clause Python Active, pushed today
58. 58
    Huginn huginn

    Create agents that monitor and act on your behalf. Your agents are standing by!

    Complete system Production-ready You want IFTTT-style monitoring and automations on your own server and are comfortable with Rails.

    ★ 50k MIT Ruby Active, pushed today
59. 59
    LocalAI mudler

    LocalAI is the open-source AI engine. Run any model - LLMs, vision, voice, image, video - on any hardware. No GPU required.

    Complete system Usable You want a drop-in local replacement for OpenAI's API covering more than just text.

    ★ 50k MIT Go Active, pushed today
60. 60
    Cal.diy calcom

    Scheduling infrastructure for absolutely everyone.

    Complete system Usable You want to self-host personal booking links without a Cal.com licence and can run Next.js with Postgres.

    ★ 50k MIT TypeScript Active, pushed today

This is a plain summary, not legal advice. The license text in each repository is what binds.