If you’re the type of Mac user who hates the idea of running an anti-virus suite but recognizes its necessity then Avira Free Antivirus for Mac might be for you. For no money down, this suite offers real-time protection and a firewall. It doesn’t include USB scanning, which is a special feature for the paid version.
What you do get is a solid anti-virus solution. AV-Comparatives gave Avira Pro for Mac a 99.8 percent protection rate from 585 malware samples. Avira Pro and Free use the same detection engine.