Media Coder:

Ripping CDs, DVDs, etc and converting between tons of video formats.
MediaCoder - Downloads

Inkscape:
Vector graphics application.
Inkscape. Draw Freely.

Filezilla:
Excellent FTP program.
SourceForge.net: Files

NMap:
Easy to use port scanner for Windows.
Download the Free Nmap Security Scanner for Linux/MAC/UNIX or Windows

Wireshark:
Network Protocol Analyzer, formerly called Ethereal.
Wireshark: Download

TrueCrypt:
Creates encrypted virtual hard drives for extra security.
TrueCrypt - Free Open-Source On-The-Fly Disk Encryption Software for Windows Vista/XP/2000 and Linux - Downloads

Virtual Box:
VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL).
Downloads - VirtualBox

ClamWin:
Open Source Anti-Virus. Very good at detecting viruses. Can be plugged into hMailServer for e-mail protection LIMITATION: Real Time scanning not implemented yet.
Free Antivirus for Windows - Open source GPL virus scanner

7-Zip:
File archiver.
Download

SharpDevelop:
Open Source IDE for the .NET Framework. Utilizes the multiple programming languages and Windows forms.
Downloads ic#code

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