Adanaxis is an action game where the fundamentals of space itself are changed by adding a fourth dimension to space. Initially, it's like learning to play a 3D FPS for the first time, as the hand and eye have to learn a whole new type of coordination. The gameplay involves rapidly blowing things out of the sky, with the usual assortment of enemies, allies, weapons, and power-ups, together with commercially sourced graphics, audio, and voice acting.
PhysicsFS is a library to provide abstract access to various archives. The programmer defines a "write directory" on the physical filesystem. No file writing done through the PhysicsFS API can leave that write directory, for security. For file reading, the programmer lists directories and archives that form a "search path". Once the search path is defined, it becomes a single, transparent, hierarchical filesystem. This makes for easy access to ZIP files in the same way as you access a file directly on the disk, and it makes it easy to ship a new archive that will override a previous archive on a per-file basis. Symbolic links can be disabled, for added safety. Finally, PhysicsFS gives you a platform- abstracted means to determine if CD-ROMs are available, the user's home directory, where in the real filesystem your program is running, etc.
Zombie Nation MUD (ZNMud) is a Multi-User Dungeon engine. It is based on the Teensey engine for its lower level socket handling. It was designed to play out zombie outbreak ideas but can easily be expanded to host other concepts. It's a massive multi-player text-based game (although it does support MXP). It also supports modern day weapons, etc.
Free Conquest and Colonization of America is a remake of a fantastic old game from Microprose called Colonization. Those who have played Civilization will find the game style very similar. In Civilization, the game time goes from pre-history to the future, but in Free Conquest and Colonization of America, all action happens during the exploration age, from 1492 to 1800. The goal of the game is to build a colony in America and make this colony grow big enough to be able to achieve independence from the motherland. A player can choose among the English, French, Dutch, and Spanish nations, each having its own qualities and problems. During colonization, the player will face many challenges, such as negotiating (and making war, if necessary) with other European colonies and native tribes. Winning the hearts of the colonists (by making they feel that the colony is their home) is the key to getting enough support to fight for independence. Allowing religious freedom in your colony will attract more colonists persecuted for their faith in Europe.