Dex to Java decompiler

Free universal database tool and SQL client

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

Style and Grammar Checker for 25+ Languages

An Android library supports badge notification like iOS in Samsung, LG, Sony and HTC launchers.

Android Asynchronous Networking and Image Loading

A gradle plugin for getting java lambda support in java 6, 7 and android

Android library that simplifies the process of requesting permissions at runtime.

Digital logic design tool and simulator

Pick a date or time on Android in style

Material Design implementation for Android 4.0+. Shadows, ripples, vectors, fonts, animations, widgets, rounded corners and more.

A VT-100 terminal emulator for the Android OS

MARY TTS -- an open-source, multilingual text-to-speech synthesis system written in pure java

Backend implementation for the Apple/Google exposure notification API.

Chat SDK Android - Open Source Mobile Messenger

Android swipe-to-dismiss mini-library and sample code

Code scanner library for Android, based on ZXing

ditaa is a small command-line utility that can convert diagrams drawn using ascii art ('drawings' that contain characters that resemble lines like | / - ), into proper bitmap graphics.

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

An extendible and configurable PDF manipulation layer library written in java.

A free J2ME emulator with libretro, awt and sdl2 frontends.

Android 1.0+ mini file explorer and manager

Org mode files Java parser

Implementation of java.util.Calendar for the Umm Al-Qura calendar system.

Scientific calculator with complex numbers and graphing of user-defined functions.

Extra application debugging interface

This library provide syncing of SharedPreferences between handheld and wearable. Welcome pullrequest!

A Hijri (Islamic) Calendar Library

Super small 1x1 clock widget for Android