libGDX is a cross-platform Java game development framework based on OpenGL (ES) that works on Windows, Linux, Mac OS X, Android, your WebGL enabled browser and iOS.
A multi-purpose Groovy library containing view injection and threading for Android using annotations. It's based on both ButterKnife and AndroidAnnotations.
FastHub is yet another open source GitHub client app but unlike any other app, FastHub built from ground up.