Termux - a terminal emulator application for Android OS extendible by variety of packages.

A libre lightweight streaming front-end for Android.

A private messenger for Android.

Telegram for Android source

A free, secure and open source app for Android to manage your 2-step verification tokens.

Free implementation of Play Services

A podcast manager for Android

Material design file manager for Android

A full-featured package manager and viewer for Android

OsmAnd

An open source GitHub Android client app, faster and concise.

A Reddit client for Android

A modification for the Discord Android App

A collection of sample apps to demonstrate how to use Google's ML Kit APIs on Android and iOS

Wrapper of syncthing for Android.

Fully featured, open source, privacy friendly email app for Android

AFWall+ (Android Firewall +) - iptables based firewall for Android

Automated mass refactoring of source code.

Android open source calendar

Slide is an open-source, ad-free Reddit browser for Android.

Github client for Android

▶ Simple and lightweight, yet polished and powerful Android video player based on ExoPlayer

Enhanced and security-focused fork of Signal.

The most powerful and beautiful Twitter client available.

Syncthing-Fork - A Syncthing Wrapper for Android.

Email-based instant messaging for Android.

Sky Map (formerly Google Sky Map, open sourced in 2012)

A material designed music player for Android

Android client for local file sharing via https://snapdrop.net/ and https://pairdrop.net