APIs & Apps (Collections & Awesome Lists): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.
Collection of Android security and analysis tools
Overview of open-source alternative frontends for YouTube, Twitter, Reddit and more
Extension whose config lists ~100 privacy frontends for popular sites
Curated Android RE training, resources and tools
Collection of reverse-engineered unofficial APIs for popular web services
Collection of third-party clients and mods for Discord
🔐🌐 Privacy-respecting web frontends for popular services
Curated list of Android security and reverse engineering resources
Collection of Chinese app and web reverse engineering articles
Documentation of Steam's unofficial, internal Web API endpoints
Chinese list of WeChat personal and official-account projects, including web-protocol bots and clients
Packages and resources for Steam development, including reverse-engineered Steam network and game coordinator clients
Collection of open-source third-party Bilibili clients
Resources for reverse engineering “unofficial APIs”.
A curated list of awesome alternative, privacy-friendly frontends.
Collection of unofficial APIs built by reverse engineering web apps
List of private APIs of various platforms (Russian-language)
List of third-party libraries and clients for the Signal messenger
A curated list of awesome Twitter Undocumented API
Collection of unofficial, reverse-engineered API libraries grouped by service category
Russian-language list of discovered private/unofficial APIs of companies without public APIs
Extended fork of unofficial-apis with more services (Uber Eats, Bolt, Trade Republic...)
Curated list of unofficial, reverse-engineered, private API libraries, clients, userbots and bridges for popular mess...
Matrix.org list of bridges to WhatsApp, iMessage, WeChat, QQ, LINE and more
Pidgin list of third-party protocol plugins, many for reverse-engineered IM protocols
A curated list of awesome third-party clients on GitHub | 收集 GitHub 上各种第三方客户端
Auto-updated documentation of Twitter/X internal GraphQL API