ClamXav

In spite of being the strongest and most secure operating system, Mac is not an antidote to attack by malicious software. Even if you have a Mac, then there should be an antivirus installed on your computer so that it can protect from external threats.

Clam Exquisites has a great user interface that uses an Open Source Antivirus engine called ClamAV. UNIX users will be familiar with this tool that you work through the command line. The program can run passive or actively and allows you to scan your entire hard drive or just a specific directory.

If your users run Windows or downloaded applications for the operating system, clamax can scan for their viruses. You can program it to regularly scan and monitor specific folders that may be more vulnerable for certain viruses or malware infections.