www.f-prot.com I think they have one. I think Norton and McAfee also have them, but I'm not sure.

Linux is pretty good at not having virii, although there are some. Anytime you download something, look at the source, and see what it looks like. You should be able to tell its a virii by that. Also most virii are made for the windows OS. But again, there are some virii for linux. Just be careful what you download.