www.zonelabs.com
Zone Alarm - free Internet firewall protection software by Zonelabs.

www.free.grisoft.com
Free anti-virus software by Grisoft.

www.ascomp.net
Free backup software by Ascomp.

www.r-tt.com
R-Drive Image 3 - Free backup software by R-Tools Technology.

www.donwload.net
Free disk defragmenter (better then the Windows version).

www.download.com
Registry Mechanic - Fixes problems with the windows registry.

www.microsoft.com
Tweak UI - Free utility to easy access windows settings.

Skype
Great free Voice over IP service.

Mozilla
Great free Internet Explorer.