ClamXav 1.0.6 (by Mark Allan)
ClamXav is a free virus checker for Mac OS X.

Virex 7 Virus Definitions 11/08/06 (by Network Associates)
Virus Update files contain up-to-date virus signatures and other information for Virex to use to protect your computer against the thousands of computer viruses in circulation and against the hundreds of new viruses that emerge between updates.

VirusBarrier 10.4.3 (by Intego)
VirusBarrier uses the most recent advances in antivirus technology.

Norton AntiVirus X 9.x-10.x Defs 11/09/06 (by Symantec Corporation)
Norton Anti-Virus 9 Defs are the latest anti-virus detection files.

Norton AntiVirus X 7.0.2 Definitions 10/2006 (by Symantec Corporation)
The attached installer will automatically update Norton AntiVirus for Mac virus definitions and engine files to detect and repair the most recently discovered Macintosh viruses.