RocketDock - Kickass Dock Bar
xoblite - nice alternate shell
Home of the Underdogs - nice abandonware-type site
Python - nice extension language.
Wilbur - terain generator for 3d gfx.
K-3D - another 3d suite that is nice.
Pixia - good paint prog with good processing, has extension for Photoshop plugins.
ModPlug Tracker - one of those music-makin thingies