<p>Sophos Anti-Virus for Mac Home Edition offers business-grade protection free for home use. And the protection literally is business-grade - the free version is based on the same Mac virus scanner Sophos offers in their Endpoint Security line. Best of all, Sophos Anti-Virus for Mac Home Edition detects both Mac and Windows malware.</p><p>PC Tools iAntivirus is free for home (and home office) use and supports Intel-based Macs running OS X 10.5 and above. An unobtrusive and efficient Mac antivirus software option that dedicated Mac users will want to try.<br/><br/></p><p>The free ClamXav supports Mac OS X versions 10.4 and above (Tiger, Leopard and Snow Leopard). Ideal for international users, ClamXav is available in multiple languages, including English, Danish, French, German, Japanese, Korean and Spanish.</p>The free VirusBarrier Express from Intego offers an on-demand scanner to ferret out Mac malware. Multiple languages are supported, including English, Chinese, Dutch, French, German, Italian, Japanese, Portuguese, Russian, and Spanish. Requires Mac OS X 10.6.6 or later.