Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Avira - Cloud based email security solution
VIPRE - Keep your data safe with VIPRE. We offer industry leading, top-rated antivirus software and cyber security protection for personal and business use.
Mac Internet Security X9 - Intego is the industry leader for Mac antivirus, security, utility and parental controls. Products include: VirusBarrier, Mac Internet Security, Mac Premium Bundle and Family Protector.
Symantec Endpoint Encryption - Symantec Endpoint Encryption protects the sensitive information and ensure regulatory compliance with strong full-disk and removable media encryption with centralized management.
Clam Xav (desktop) - Specifically with Clam Xav Sentry configured to scan inserted disks.Please read global comments on this question for an explanation of why desktop apps are being recommended for virus detection on ios devices.