Phalanx is a chess playing engine with agresive playing style. It does not have its own graphical interface, but can be used with general chess interface Xboard (Winboard) by Timm Mann. There is also a commercial version that runs as a native Fritz module and thus can be used with the Fritz graphical interface.
The Julius framework is a general software architecture for medical visualization, simulation, and navigation. It offers interfaces for combining the various facets of computer-aided and image-guided surgery into a single environment. Developers have the ability to extend the framework with their own algorithms and techniques. The system is platform-independent and runs on a mid-range configuration as well as on high-end graphics workstations. It is implemented using object-orientation and state-of-the-art software engineering principles.
Tiger is an emulator for the TI92 - a powerful calculator from Texas Instruments. It's written entirely in C, using the 68k-emulation routines from UAE, the fameous Amiga emulator. You will always need a real ROM-dump from the TI92 to run it.
Tuxánci are czechoslovak multiplatform action game. In the begining it was inspired by czech game Bulánci (which is however only for MS Windows), but now it goes its own way. The game is programmed in language C and the rendering core is based on SDL library. Man can play two-players game on one computer or in network multiplayer.