Carnegie Mellon University

Free
Panda3D is a game engine, a framework for 3D rendering and game development.
Free
CarnegieCadets is a game that teaches Internet safety and computer security
Free
PsyScope is a program to design and run psychological experiments.
Free
It automatically evaluates your design with a predictive human performance model
Free
This program is an innovative 3D programming environment.
Free
The Panda3D SDK contains development libraries for developers