The Nintendo DS hardware offers a variety of possibilities for creating music as well as interacting with music. TheRain first had the idea of using the DS as a MIDI controller and created the DSMIDI, a DS cartridge that adds a standard MIDI port to the DS that can be used by homebrew DS software. Read more about DSMIDIWiFi gets DSerial support (NDS misc)
HEP is working on BeetleRun, which is a conversation of an old MS DOS game called Antrun. Your job is to guide an ant trough pipes. The pipes are already on the field and just need to be rotated correctly. Remember that the game is in progress and bugs might occuor here and there. Read more about BeetleRun (Beta) (GP2x Game)
yackom has released an early version of DSQuake, along with a video hosted on YouTube. You can find the link to the video on his page as we don't integrate those. Read more about DSQuake (Pre-Release) (NDS Game Port)