Avast Free Antivirus
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Full user review
"Semi-okay since it's free"
Can't think of anything else.
Cannot use monitoring features. It slows down my computer (stalls for a while). I disabled them.
Takes hours to complete a full system scan.
This seems to work as good or better than any other FREE Mac antivirus. I have tried them all. I will continue to use it to occasionally run a scan, which will be overnight since it takes about 5 hours.