ClamXav 1.0.8
ClamXav is a free virus checker for Mac OS X. It uses a slightly modified version of the tried, tested and very popular clamav open source antivirus engine as a back end.
MacScan 2.4.1
If you take into account the very loose definition of spyware (still not any for Macs in the sense of the Windows world), MacScan is still a very useful product for the following:
Norton AntiVirus 10.1.2
Symantec's Norton AntiVirus 10.0 for Macintosh is the world's most trusted antivirus solution for Macintosh systems. It removes viruses automatically, cleans infected Internet and email downloads, and defends against emerging
Sophos Anti-Virus 4.8.13
Sophos Anti-Virus protects your network, desktop and even remote laptop computers from the latest viruses, Trojans, worms and spyware. The quality of its award-winning technology has been confirmed time and time again by independent bodies such as West Coast Labs, ICSA Labs and Virus Bulletin.
Tiger Cache Cleaner 3.2.11
Tiger Cache Cleaner is a utility designed to provide easy access to numerous OS X maintenance and utility options. When used in combination with OS X's disk repair tools, it can be very effective in curing many system problems