Agax
An expandable free Mac antivirus program by John Dalgliesh. It offers both standard virus-scanning facilities and more advanced background protection, so you don't get infected in the first place.
Mac Virus
[No longer current, but good for knowing the history of Mac antivirus efforts.] Computer virus news, help, and reference for Macintosh users. Anti-virus software information. Viruses and the Mac FAQ, by David Harley. Macintosh Virus Questions and Answers, by David Miller.
Mac Virus
Macintosh antivirus news, advisories, downloads and reviews of mac virus scanners and definitions of viruses and trojans for Mac OS and Mac OS X.
Nimda spreads via Samba Services
Example/Logs of Nimda virus/worm in action on Mac OS X server Samba Service.
Norton AntiVirus for Macintosh
This antivirus utility from Symantec Corporation gives you unparalleled protection that's safe and easy to use. Use it against viruses in Internet downloads, email attachments, CDs, floppy disks, shared files, and networks. It detects and removes all known viruses, plus unknown and unidentified macro viruses.
Robert Slade History: Apple Virus
Discusses an Apple ][ computer virus in the early 1980s.
The Code 9811 Virus
On the encounter with an uncommon Macintosh computer virus, its symptoms and how to get rid of it.
Tracker, DelProtect, and Scanner
These antivirus utilities by Ioannis Galidakis are meant to track down 68K viruses on your system. They MAY prove to be useful, if you are unable or unwilling to purchase professional commercial antivirus software, or in conjunction with such software.
Vaccine
A free HyperCard virus utility written by Bill Swagerty that will inspect all the stacks on your hard drive, or any part of it, for most HyperCard viruses.
VirusBarrier
Complete antivirus software suite for the Macintosh to eliminates all known viruses including system and macro viruses. Supports archive scans
WormScanner
This program by James Walker scans your local drives for the AutoStart 9805 worm variants (A through F), and will also alert you to unknown files with suspiciously similar properties.