If you're looking for a free office suite, go to www.openoffice.org
. It's compatible with Office applications and very, very good. You'll be extremely surprised at this one.
Image editor - www.gimp.org
. Extremely powerful and almost as good as Photoshop in most respects. Really.
Image editor - for editing and such, www.irfanview.com
Awesome antivirus - www.avast.com
. Completely free for home use, and updated very often. Uses much less resources than Norton or McAfee and more effective too, IMO.
Another free antivirus is AVG, which is also very good - http://www.grisoft.com/
Good basic CD/DVD burning software - http://www.cdburnerxp.se/
. I actually use this on one of my desktops and it's rock solid.