Open source library projects
Every project in the registry tagged library, ranked by real GitHub adoption.
The library for web and native user interfaces.
Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
The motion graphics toolbelt for the web
Fast key-value DB in Go.
UI kit to make beautiful, animated interfaces, faster. Customizable. Open Source.
Golang gRPC Middlewares: interceptor chaining, auth, logging, retries and more.
Fast persistent recoverable log and key-value store + cache, in C# and C++.
Declarative data automation language and Go runtime for structured extraction workflows.
✨ PTerm is a modern Go module to easily beautify console output. Featuring charts, progressbars, tables, trees, text input, select menus and much more 🚀 It's c
Build your design system in React, Solid, Vue, Svelte or Vanilla. Powered by finite state machines
Apache Log4j is a versatile, feature-rich, efficient logging API and backend for Java.
Ghostty for the web with xterm.js API compatibility
📈 Beautiful, high-performance Graphs and Charts for React Native built with Skia
Portable, simple and extensible C++ logging library
Codex computer use, decoupled from the app, for usage inside any harness.
Python package for scraping recipes data
Litter is a pretty printer library for Go data structures to aid in debugging and testing.
A Python stream processing engine modeled after Yahoo! Pipes
Whisper is a file-based time-series database format for Graphite.
Create JavaScript libraries in a simple and intuitive way.
zerocode-tdd is a community-developed, free, open-source, outcome-driven automated testing framework for Data Pipelines, ETL, REST API, Kafka(Data Streams), Dat
Apache Log4net is a versatile, feature-rich, efficient logging API and backend for .NET
A Java library for parsing and building iCalendar data models
The best PTT library
A simple, self-hosted service to keep track of your personal library 📚
Mikrotik RouterOS API PHP client for your applications
Invisible bot protection that respects user privacy
Related tags
Frequently asked questions
How many open source library projects are there?
This registry tracks 27 projects tagged library, with 427,590 GitHub stars between them. The most-adopted is react at 252,095 stars.
Are these library projects free to use?
Yes — 27 of the 27 carry an explicit open-source licence across 5 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which library project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these library projects still maintained?
23 of the 27 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.