Stetho is a debug bridge for Android applications, enabling the powerful Chrome Developer Tools and much more.
PathPicker accepts a wide range of input -- output from git commands, grep results, searches -- pretty much anything. After parsing the input, PathPicker presents you with a nice UI to select which files you're interested in. After that you can open them in your favorite editor or execute arbitrary commands.
Distributed SQL query engine for running interactive analytic queries against big data sources.
An extensible iOS and OS X animation library, useful for physics-based interactions.
An open IDE for web and native mobile development, built on top of Atom