Free homebrew multimedia-related applications for the Nintendo DS platform. You will find audio players of various forms (sequence/tracker stuff included), music creation tools (timing, tuning and such), painting tools, bookreaders (including PDF) and a handful of video players (including Moonshell).
I feel like school, back when I was actually in school, was more entertaining though, because of how much I get to interact with people, hang out with friends, and other stuff like that. All I get to talk to at work is my boring coworkers lol