smooth is an object oriented class library for Win32 and Linux written in C++. It's meant to become an alternative to toolkits like Qt.
Mac GoogleSeach is an OpenSource effort to implement the Google SOAP APIs on Mac OS X.
RUnit is an OSX popup terminal-like application in which you define aliases to help you perform defined tasks with parameters. Unix shell scripts, binaries and any executable tasks can be lauched.
2D shooting game written in Objective-C using the Cocoa framework for MacOS X.