PDF Creator: print to PDF files

 http://www.pdfforge.org/products/pdfcreator

Open Office: a full service office suite 

http://www.openoffice.org/

Ecalc- online scientific calculator or down loadable as a stand alone.

http://www.ecalc.com/ 

CDBurnerXP: burn cd,dvd,Iso images for free, easy to use

http://cdburnerxp.se/download

Foxit PDF reader: allows book marking, highlighting, and adding text to your PDF's

http://www.foxitsoftware.com/pdf/rd_intro.php

VLC Media Player: a great platform for viewing you media

http://www.videolan.org/vlc/

Picasa: the best free picture editor and organizer out there

 http://picasa.google.com/ 

WordWeb: The best dictionary and thesaurus out there period

http://wordweb.info/free/

Grisbi: Free personal finance manager, good program

http://www.grisbi.org/download.en.html#windows