Meter is a simple micro-benchmarking tool for Android (and Java) projects. This is not a profiler, this is very small utility class that designed for making benchmarking easy.
Linguist is a simple framework to translate your app to over 100 languages automatically.
ImageView Helper for Android that supports pinch-to-zoom and swipe-to-dismiss gesture.
Loupe provides modern image viewer ui with super simple code. You can implement the Twitter-like image viewer in 10 minutes.
See also Introducing Loupe: 10 minutes to implement Twitter-like image viewer.