Your Mac needs Antivirus !
Mac users usually think don’t they need an anti-virus program because MAC’s are pretty much virus free. Fortunately for APPLE, since the MAC platform is constantly growing and making APPLE more money, more viruses are now targeting the MAC. 
It's true - Mac viruses really do exist, although fewer viruses target the Mac OS compared to Windows. In addition, there are cross-platform threats that can impact Mac users. Though the risk of cross-platform threats is relatively small, it's a risk that is on the increase as attackers move to Java and other third-party software exploits.
That’s unfortunate for MAC users but there’s no need to panic just yet, there has been many annti-virus program available for the MAC for quite a while.
Now here you can free download the free antivirus like Sophos and pay-per-use antivirus software as McAfee, Norton AntiVirus, BitDefender, Kaspersky, Avast, Bitdefender....
MacKeeper
MacKeeper is a bundle of the utilities for security, cleanup, data control and optimization. Having all of them in one app allows you to automate routine tasks and keep your mac attended with a few clicks!
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Norton for Mac
Norton AntiVirus 11 for Mac is the world’s most trusted antivirus solution for Mac systems. It removes viruses automatically, cleans infected Internet and email downloads.
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MacFee
McAfee VirusScan for Mac is another antivirus software for Mac computers. Supporting both Intel and PowerPC-based systems.
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Avast
Avast antivirus Mac Edition provides a complete enterprise-class anti-malware solution for the Mac platform that protects users valuable and irreplacable data and programs.
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BitDefender
BitDefender Antivirus will protect your Mac from the new breed of Mac viruses, while also preventing Windows viruses from spreading to PCs.
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Kaspersky
Kaspersky Anti-Virus for Mac has been developed to meet the specific security requirements of Mac users who know the value of the data stored on their computers, as well as the need to keep them running smoothly.
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Intego VirusBarrier X6
VirusBarrier X6 is a Mac OS X antivirus that features full anti-malware protection together with firewall, network protection, anti-phishing, anti-spyware features and more.
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Sophos Home Edition
Sophos Anti-Virus Home Edition will keep your Mac safe from viruses, Trojans and worms without getting in your way. High-grade protection without slowing you down.
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ProtectMac
ProtectMac AntiVirus detects malicious software, complimented by an updating system that automatically delivers and installs incremental updates in the background, to ensure that you stay on top of any security problem.
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Panda Antivirus
Panda Antivirus is a powerful antivirus that offers protection from malware (viruses and other threats) in Mac environments.
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PC Tools iAntiVirus
iAntiVirus will allow you to be protected against the most nefarious cyber-threats attempting to gain access to your Mac and personal information.
Download nowAVG Anti-Virus 2012
AVG Anti-Virus 2012 protects you from Virus, Spyware, Malware, Worm or Trojan horse. AVG Antivirus and antispyware protection from the world's most trusted security company. Use the Internet with confidence.