Best Open Source free Libraries
A curated list of the most popular GitHub repositories tagged with free. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1codecrafters-io/build-your-own-x
Master programming by recreating your favorite technologies from scratch.
#2public-apis/public-apis
A collective list of free APIs
#3DigitalPlatDev/FreeDomain
DigitalPlat FreeDomain: Free Domain For Everyone
#4justjavac/free-programming-books-zh_CN
:books: 免费的计算机编程类中文书籍，欢迎投稿
#5cloudcommunity/Free-Certifications
A curated list of free courses with certifications. Also available at https://free-certifications.com/
#6RocketChat/Rocket.Chat
The Secure CommsOS™ for mission-critical operations
#7DataTalksClub/data-engineering-zoomcamp
Data Engineering Zoomcamp is a free 9-week course on building production-ready data pipelines. The next cohort starts in January 2026. Join the course here 👇🏼
#8luong-komorebi/Awesome-Linux-Software
🐧 A list of awesome Linux softwares
#9zulip/zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
#10maotoumao/MusicFree
插件化、定制化、无广告的免费音乐播放器
#11basarat/typescript-book
:books: The definitive guide to TypeScript and possibly the best TypeScript book :book:. Free and Open Source 🌹
#12LiLittleCat/awesome-free-chatgpt
🆓免费的 ChatGPT 镜像网站列表，持续更新。List of free ChatGPT mirror sites, continuously updated.
#13255kb/stack-on-a-budget
A collection of services with great free tiers for developers on a budget. Sponsored by Mockoon, the best mock API tool. https://mockoon.com
#14StartBootstrap/startbootstrap-sb-admin-2
A free, open source, Bootstrap admin theme created by Start Bootstrap
#15Kareadita/Kavita
Kavita is a fast, feature rich, cross platform reading server. Built with the goal of being a full solution for all your reading needs. Setup your own server and share your reading collection with your friends and family.
#16is-a-dev/register
Grab your own sweet-looking '.is-a.dev' subdomain.