I'd like to know I can be sure that all of these files I can download here are Malware free. Is there any way to check if all of these files are clean and don't open a backdoor on my Mac?
Malware in Pirated APPs?
I think its possible yes! But i've never seen or heard of a Mac having a virus.
As long as you use reputable sources and known cracker groups like TNT which 95% of Cmacapps releases are TNT Cracks then you have now worry. KeyGens are usually released by the group CORE.
I have been using and posting these releases for years and never had any issues.