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 CFSLT by RSG Software

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

 steelTOOLS.org (This site offers many design and analysis tools)
 DSNWinbeam (A continuous beam analysis program)

 If you know of any useful engineering software, email your suggestions to [email protected]