Hello, welcome to the site, all the programs here are free.
They will only work in 3D Studio Max, and although it was not possible to test them in all versions of Max the programs should work back to version 2012 of 3D Studio Max.
I am the author of all the programs and my experience goes way back to when i wrote a suite of utilities called Key 3D, later to be renamed Quickscape.
I learned a lot during that time and the programs here are what came afterwards, they are simple but useful and in most respects they are what i thought was missing from 3D Studio.
I hope that you get some use out of them.