We had Concentration before but had to remove it because too many people found it offensive, and I can't really blame them to be honest. I've added the other 5 though.
Here's the full, up-to-date map list, if you wouldn't mind taking a look and letting me know which ones need removing...
67th way and Minecraft have 2 separate versions for a reason but, other than those, I can't think of any that are meant to have duplicates. Should I remove the old Westwood or is it worth keeping both? And is it best to remove b2 of Cloverfield or are there problems in b4?
All the Counter-Strike maps will have to stay in the list for now because the map folder is shared between all 4 GMod servers and they're used on some of the others. The map vote addon just adds all maps with the right prefixes. I can mod that in the future if necessary but easier to just let it continue doing that.