I've been using Clam AV for several years although to tell the truth I only run it maybe once a year when I think about it. I never seem to get any viruses or bots or whatever there is now.
I currently use Malwarebytes as well. I'm annoyed that they won't provide upgrades for older versions of OS X, but you can't have everything and my MacBook Pro running OS X 10.10 was getting long in the tooth. I recently bought a MacBook Air with MacOS 11.5 and Malwarebytes works fine on it.
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Mike Lewis
She don't lie, she don't lie, she don't lie-- propane
Photos and travelogues here: mikelewisimages.com