Calculon is a testing DSL
for Google Android. It allows you to write activity tests and user story tests.
Fragment-Switcher is an adapter-based, state-saving fragment container similar to a ViewPager.
It was designed with the NavigationDrawer and Tab patterns in mind but can be used anywhere that you switch between fragments and would like to retain instance state.
JAva Decompiler is not maintained decompiler for the Java programming language, but it is still a powerful tool.