Free

Premium

• Panda Antivirus for Mac
• bitdefender for Mac
• McAfee VirusScan
• Kaspersky for Mac

• Malwarebytes Anti-Malware for Mac. Great free anti malware product, formerly known as Malware Medic
• Mac Malware Guide - a blog/article about Mac Malware from the Malwarebytes stable.
• AppSO crashes repeatedly. A discussion on the Apple Support Communities forum regarding a trojan ("ZIP devil"), with lots of useful information about manual malware removal.

Shellshock BASH vulnerability and how to fix it

• http://www.bleepingcomputer.com/forums/t/550292/apple-releases-security-patch-for-the-bash-shellshock-vulnerability/