Scribus — Wow! This is a major program with a lot of capabilities…probably too many for me!
PrimoPDF This is getting good reviews; I’ll most likely give it a try to generate docs to post on my website at school.
Celestia — Looks great! This is a space simulation that seems like it has a lot to offer.
Audio and Video
Audacity is an audio recorder that does just about everything a teacher could ask for.
The Levelator is an application that automatically adjusts the levels of an audio recording to create a more professional final product.