《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 代码。简体版和繁体版同步更新，English version ongoing

Google core libraries for Java

Dex to Java decompiler

Telegram for Android source

视频播放器（IJKplayer、ExoPlayer、MediaPlayer），HTTPS，16k page size，支持弹幕，外挂字幕，支持滤镜、水印、gif截图，片头广告、中间广告，多个同时播放，支持基本的拖动，声音、亮度调节，支持边播边缓存，支持视频自带rotation的旋转（90,270之类），重力旋转与手动旋转的同步支持，支持列表播放 ，列表全屏动画，视频加载速度，列表小窗口支持拖…

Cute view animation collection.

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

OpenPDF is a free Java library for creating and editing PDF files, with a LGPL and MPL open source license. OpenPDF is based on a fork of iText. We welcome contributions from other developers. Plea…

An XMPP server licensed under the Open Source Apache License.

Anthelion is a plugin for Apache Nutch to crawl semantic annotations within HTML pages.

Android open source calendar

Ho Ho Ho

A plugin framework on android,Run any third-party apk without installation, modification or repackage

Implement screen capture without root on Android 5.0+ by using MediaProjectionManager, VirtualDisplay, AudioRecord, MediaCodec and MediaMuxer APIs

The android port of the 2048 game (for offline playing)

Wally is a fast and efficient wallpaper application for Android

MP4 video transcode using Android MediaCodec API, pure Java (not LGPL nor patent issue!). Supports API >= 18.

Personal expense manager

A backport of the Android 4.2 NumberPicker

Completely Translate Android apps in-place aka Google translate in Chrome

A sample project that shows how Apache POI can be used in an Android application

Android application that loads gifs via gfycat for efficiency's sake

Project Oxford Mimicker Alarm

Watch face framework for Android Wear developed by ustwo

We're proud to introduce the TopCoder UML Tool: An easy to use, consistent modeling tool for use in Design and Development competitions. The new tool was designed and developed entirely by the TopC…

Setup Fabric Crashlytics CI friendly

Android Xposed Module to apply proxy for a specific app.

Gloomy Dungeons II - a continuation of old-school 3d-shooter.

Android time picker with seconds field