Command and Conquer Tiberian Sun
Here's a map for Standard Tiberian Sun.
Here's another great map for Tiberium Sun! This is a 1 v. 1 map, intended for Skirmish use.
Lt_Guarnere, the creator of the excellent MP Oceania and MP New Zealand maps, is back again, this time with maps of the UK and Ireland.
This map is for 2-4 players, and has many neutral forces in the area that will be hostile to any side.
Here's a good 200X200 map for the Standard Tiberium Sun, intended for Skirmish use.