Mad Catz RAT 3 Mouse Drivers/Software
I have a Mad Catz RAT MMO7 mouse and it works fine without any drivers with OS X 10.11 as a regular mouse. None of the key programming, etc. will work without the Mac drivers and nothing is available or supported.

The company went bankrupt several years ago and closed down, but they have just recently restarted, so new stuff may be coming out as they update their web site.