ClamXav is a popular virus checker for OS X.
ClamXAV keeps threats at bay and puts you firmly in charge of your Mac’s security. Scan a specific file or your entire hard drive. Set it to scan automatically or run instant checks on suspicious files. It’s entirely up to you.
ClamXAV is light on processing but heavy on malware. You won’t even notice it working away in the background - but threats to your Mac will, as virus definitions are constantly updated.
Whether you’re a home user, business user or education user, ClamXAV provides effective malware protection on a single Mac or an entire network. With generous volume discounts available, it’s a small price to pay for peace of mind.