ClamXav, free Mac antivirus software that developed based on famous open source ClamAV engine to scan / detect virus thread on your Mac platform. However, ClamXav Mac security feature is simple if you compare its features, speed, or usability with commercial antivirus programs that cost a lot more, but it does a good job of finding viruses at an unbeatable price: free
The free ClamXav Mac anti virus scanner offers limited realtime scanning, the ability to scan email, on-demands scans, and support for multiple languages: Danish, English, French, German, Italian, Japanese, Korean, Polish, Spanish and Taiwanese.
Beside that, an additional application that comes with ClamXav, called ClamXav Sentry, can be set to monitor folders in real time. ClamXav Sentry will sit in your menu bar when activated and silently watches over the folders you point it to. Telling Sentry which folders to watch involves dragging the folders into the ClamXav Sentry window, which can be a little cumbersome if you’re trying to select several folders at the same time. When Sentry detects a virus, it pops up an alert that allows you to either put the virus in quarantine (assuming you’ve set up a quarantine folder), move the file to the trash, or ignore the alert. The application also supports Growl, the systemwide notification feature, which allows ClamXav and Sentry to alert you.
This free Mac antivirus software ClamXAV can supports Mac OS X 10.5 and 10.4 platform, as well as providing limited support for Mac OS X versions 10.3 and 10.2.