Android was designed and built by Google in 2008. The operating system is written mainly in Java, with core components in C and C++. It is built on top of the Linux kernel, giving it incorporated security benefits.
🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。
Open source real-time translation app for Android that runs locally
FastHub the ultimate GitHub client for Android.
An Android Alerting Library
Mobile, desktop and website Apps with the same code
GameStream client for Android
The FlutterShop template makes it easier to develop an e-commerce app using Flutter. It includes all the necessary pages to build a shopping app for both Android and iOS using flutter.
Generate a customized Privacy Policy and Terms of Use document for your mobile apps
📱 List of open source Flutter applications 
Reqable issue track repo
Text editor - Notes & ToDo (for Android) - Markdown, todo.txt, plaintext, math, ..
An unofficial https://bgm.tv ui first app client for Android and iOS, built with React Native. 一个无广告、以爱好为驱动、不以盈利为目的、专门做 ACG 的类似豆瓣的追番记录，bgm.tv 第三方客户端。为移动端重新设计，内置大量加强的网页端难以实现的功能，且提供了相当的自定义选项。 目前已适配 iOS / Android / WSA、mobile / 简单 pad、light / dark theme、移动端网页。
Android Library that lights items for tutorials or walk-throughs etc...
DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
Android Developer Roadmap - A complete roadmap to learn Android App Development
GitHub client for Android based on the abandoned official app
All in one emulator on Android!
PlainApp is an open-source application that allows you to manage your phone through a web browser. Access files, videos, music, contacts, sms, calls, and more from your desktop using a secure, easy to use web interface!
拷贝漫画的第三方APP，优化阅读/下载体验
Created by Google
Released September 23, 2008