Trainers I do not recommend
I advise choosing an alternative to Cheat Happens / Caliber because of the practices discussed on FileForums. This particular exclusion was not presented as a malware report.
Cheat Happens (CH)
These are single-player trainers. If you have a choice, my recommendation is to use another trainer; the three discussions below explain the reasons behind the original recommendation.
Caliber
Caliber is listed separately in my file, with the same FileForums references and the same recommendation to prefer an alternative.