Sophos Anti-Virus for Mac Home Edition
Full user review
"Memory leaks BAD!"
Found some windoze viruses in zip files of mail attachments
Burns through 8GB of RAM and keeps asking for more. I reboot to free up some RAM and it's only an hour or two later, I'm out of RAM again. Had to uninstall this in order to make my Mac usable once again
Avoid like the plague.