If you want to know whether or not a mod is allowed, just ask in this topic and an admin can reply.
Ex. "Is randomcleo.cs allowed?", "Is this skin too flashy?", etc.
I'll also compile a list of allowed / not allowed mods below, obviously this does not include every mod and just because a mod is not listed under "not allowed" does not mean it is allowed, the server rules still apply & use your common sense. This is for mods where the legality may not be clear, obviously aimbot isn't allowed and I shouldn't need to list that under "not allowed" for you to know that.
If you're unsure, ask here.