Random color by object or group?

I’m bringing models into various other 3D programs from SU and would like to be able to assign random colors so that material applications in the other apps only apply to specific objects or groups.

Is there a plugin that will do this?

Maybe you could try “color by Layer” or “color by Tag” in default Sketchup.
Please update your profile with the correct information as it helps us giving you the right answer!