Free Business and Office Software

 OpenOffice.org - Open Office (A free full-featured office productivity suite that's compatible with Microsoft Office)
 Cnet.com - Free Office Suites Software - Free Software & Apps

Free Engineering Software

 Cold-formed steel design software AISIWIN by DEVCO
 Cold-formed steel design software CFSLT by RSG Software

 Free computer software from Florida DOT
 Onlinecivilforum.com - Free structural software

 Mathcad Express Free Download
 Structural Engineering Library 6.0 by ENERCALC (free trial)

 If you know of any useful engineering software, email your suggestions to info@PDHonline.com