EDuke32 is a Duke Nukem 3D port that adds several hundred new features for players and developers of user content, including hardware accelerated renderers that take advantage of modern graphical hardware.
smc-get is a level package manager for Secret Maryo Chronicles. It is designed to be similar to apt-get.
A fast full-text search engine for MySQL.
A new engine for the old game X-COM: UFO Defense/UFO: Enemy Unknown.