Stars
Reveal CSS animation as you scroll down a page
The javascript library for magical scroll interactions.
Automatic synchronization for Core Data apps, between any combination of Mac OS X and iOS: Mac to iPhone to iPad to iPod touch and back again.
Git extensions to provide high-level repository operations for Vincent Driessen's branching model.
tap + haiku = tapku, a well crafted open source iOS framework
A calendar component for the iPhone (the UI is designed to match MobileCal)