Open Source
Crossplatform Java
SKForum - web-based forum system
Oddspace - multiplayer space shooter
Mp3Fix - Automatically fix the filenames of all your mp3s, fix ID3 tags
SKPlaylister - Generate playlists from your mp3s
SKTranslator - Ease localization of your java program
Windows
BoxedHotkeys - hotkey program for windows
PressedKeys - keep track on how fast you type
Misc
Bit - The Bit from the movie Tron, on your desktop