Reactive Extensions for the JVM
Optimizer for mobile applications
A declarative framework for building efficient UIs on Android
The regex-centric, fast lexical analyzer generator for C++
WebSocket & WAMP in Java for Android and Java 8
Task Parallel Engine for Android
c++/java library for thread support and other useful stuff
Android common lib, ImageCache, HttpCache, DropDownListView, etc.
Crash report for Android apps