Real-time 3D viewer for LDraw LEGO models with OpenGL acceleration.
LDView is a 3D viewer for LDraw LEGO models with a focus on quality rendering with good performance. It also contains many features geared specifically toward LDraw part authoring.
XLogo - A LOGO learning and drawing application built for Mac OS X
A modular audio programming language, designed to write applications quickly. Its main goal is real time audio processing, but it should be used for any kind of development.