MIT License
Do whatever you want. Just keep the copyright notice.
Commercial use
✓ Yes
Modify
✓ Yes
Distribute
✓ Yes
Must open source changes
✗ No
Must attribute
✓ Yes
Patent grant
✗ No
What this license means
The MIT License is the most popular open source license. It lets you use, copy, modify, merge, publish, distribute, sublicense, and sell the software — with essentially no restrictions. The only requirement is that you include the original copyright notice and license text in any copy or substantial portion of the software.
When you encounter this license
Use MIT-licensed tools freely in any project — personal, commercial, proprietary. You can bundle it, modify it, sell products built with it. Just keep the license file somewhere in your project. This is the easiest license to work with.
Watch out for
No patent grant — if the software implements a patented algorithm, the MIT license doesn't protect you from patent claims. No warranty, no liability — standard for all OSS licenses.
Tools using MIT License (326)
Scalable load tests in plain Python
Open source LLM engineering platform
Find and fix problems in your JavaScript code
Find secrets with Gitleaks
Array framework for Apple silicon
ES module bundler
Serverless Functions Made Simple
OpenAPI-generated API documentation
The original CI/CD automation server
Nix Packages collection & NixOS
Simple, unobtrusive authentication for Node.js
Docker compose stack manager
Productive web framework for Elixir
Memory engine and app that is extremely fast, scalable. The Memory API for the AI era.
Claude Code skills that turn any codebase into an interactive knowledge graph you can explore, search, and ask questions about (Multi-platform e.g., Codex are supported).
Lightweight composable Go HTTP router
Instant-loading web apps, without effort
High-performance JavaScript tools (parser, linter, formatter)
Primitive and flexible state management for React
This guide is for informational purposes only and does not constitute legal advice. For licensing decisions in commercial products, consult a qualified attorney.