Dawn of the Tiberium Age (DTA) is a stand-alone mod that combines Tiberian Dawn (C&C 95) and Red Alert. While classic mode gets as close to the original game-play and balance as possible, Enhanced mode provides improved game balance and a lot of fun new stuff. DTA features many customization options for Skirmish and multiplayer (where you can play as GDI, Nod, Allies and Soviet on over 100 maps), challenging original singleplayer missions, as well as co-op missions. Since this is a stand-alone mod, you don't require anything but the mod itself to be able to play: the original game is not required.
A minimap demonstration of harvesters sticking to their closest refineries with a patch written by me. There are 4 outposts, one on each side of the map. Each outpost has 3 harvesters, but only 1 refinery. In original TS the harvesters move all over the map to any free refinery and the economy plummets, but with the patch, the harvesters use the refinery in their own outpost. You can clearly see the improvement in the movement of the harvesters (pink pixels on the minimaps) as well as on the rates that the resources are harvested at.