A sample web application with an embedded jetty server. Really, quite sexy.
Showcase any GitHub repo's success with these two simple, static buttons featuring dynamic watch and fork counts.
Capturing JVM- and application-level metrics. So you know what's going on.
Collaborating on an open food data standard and API for the world.
A listing of open source efforts at Scenedipity on GitHub
Algorithmic URL Shortener
Three20 is an Objective-C library for iPhone developers