Stratagus is a cross-platform real-time strategy gaming engine. It includes support for playing over the Internet/LAN or playing a computer opponent. The engine is configurable and can be used to create games with a wide range of features specific to your needs. Some games based upon it include Battle of Survival, Wargus, and Battle for Mandicor.
Mad Bomber is a clone of Activision's 1981 Atari 2600 classic, "Kaboom!" The Mad Bomber rushes back and forth at the top of the screen and drops bombs which you must catch with your bucket. If one drops, you lose a bucket and go back one level. One or two players can play, using keyboard or mouse. There is also a "versus" mode where player two controls the Mad Bomber.
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/single player first person shooter, built as a major redesign of the Cube FPS. Much like the original Cube, the aim of this game is not necessarily to produce the most features and eye candy possible, but rather to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine.
JBackpack is a personal backup program. It features incremental backups, network transparency, and encryption. JBackpack uses rdiff-backup for all backup and restore functions. SSHFS and SMB are used to access remote file systems. EncFS is used to encrypt backup destination directories.