Shuriken is an XML-based tool for Linux system administrators to set up spans of time when the system should be up. Using the RTC daily alarm (requires BIOS, hardware, Linux support), the system will automatically power-on (if it is off) for these intervals. Automatic power-off is supported, but this feature is not recommended if users intend to log in to the system and not have it shut down on them.
furious_tv is a PVR backend that uses an SQLite database to hold XMLTV listings data. Using that data, it can automatically execute commands to record TV shows off of a capture device (multiple capture devices are supported). If Shuriken is installed, furious_tv can also automatically power the system on/off for recordings to save power.
Avoision is a very simple arcade-style game. There's no story, no fancy graphics, no campaigns--just frantic, high-speed gameplay. Gameplay consists of moving a green block around with the arrow keys. The goal is to capture the red block before the timer runs out to score points. You must avoid all the white blocks that appear as you progress through the game.
The Grind is a simple game about avoiding responsibility at work. The goal is to acquire as little work (as few "to-dos") as possible throughout your 9-5 workday. Wander around the cubicles and hide from the men in suits - if they're coming your way, that means they want to give you work! Use the arrow keys to move, space to start, and escape to exit.
Cretan Hubris is an infinite maze escape game set in ancient Greece. As the master architect Daedalus, having just completed the Labyrinth, you must now escape your creation while staying ahead of a deadly energy wave sent by petty and jealous gods. Features include customizable controls, joystick support, and sound effects.
If you are looking to completely separate content from structure and presentation using something like DML, take a look at DML2 (also here on freshmeat.net).
As an example of what it's capable of, its documentation is in 2 forms: multi-part HTML, and single-file text. Both were written using the exact same content file with 2 different templates.