I was wondering if this mod was allowed since all it did was show framerate count and if it isnt, is external software that shows framerate count also disallowed (ex. Rivatuner using MSI Afterburner or HWInfo64, Cleanmeter and others)? Thanks

I'm pretty sure something like that wouldn't be allowed. If you wanna see your fps in vanilla you can use the F3 screen tho

What about an external software then? It doesn't affect the game in any way

Yeah external software should be fine