AweMUD is a MUD server for use with fantasy-settings. Features include fully dynamic objects and characters, an advanced scripting system, and custom worlds. The engine will eventually have completely interactive rooms (items can be placed under benches, doors can be destroyed), complex magick, and interactive NPCs.
Umbra is a simple computer role-playing game, written in Python. The world is randomly-generated for new play every time, but there is an eventual goal and storyline. It was heavily influenced by rogue-like games, Alternate Reality, console RPGs, and the works of H.P. Lovecraft and Clark Ashton Smith.
rndgen is a Java application that mirrors the functionality available from Leon's Random Generators. They use a database of words and sentence forms to create various kinds of random text, including band names, song lyrics, jokes, advice, and essays. They are whimsical and mostly nonsense. You definitely need a particular sense of humor to appreciate them.
NetShips battle is a popular naval battle game for two players connected across the network. It provides a modular concept of three layers (network layer, game logic, and user-interface). Currently only an ncurses (console) user interface has been implemented, but adding an X11 interface or porting to MS-Windows should be easy.