[ac29]

ClamAV?

[mariopt]

Used to be free, now it's a paid product.

[hoistbypetard]

It still looks free:

https://github.com/Cisco-Talos/clamav-devel

That's licensed under GPLv2, available for download without any kind of key/password, and includes build instructions. The poster on mac could even use homebrew to install it with one command.

And they even include instructions for mirroring the signatures here:

https://github.com/Cisco-Talos/clamav-faq/blob/master/additi...

What part of it requires payment?

[gmac]

https://www.clamxav.com/ was free and is now paid — perhaps the poster was thinking of that.

[hoistbypetard]

That seems likely. I forgot about ClamXAV.