C&C: Red Alert Age of Empires II: HD edition on Steam Total Annilhation Warcraft 3/2 StarCraft: BroodWar
So much this. ---
QFT. Especially for Total Annihilation and Red Alert. When I received Total Annihilation way back when, I played it so much on my first playthrough that I grew dizzy when I finished. xD That would be 7 hrs of straight RTS'ing... o____o I regret nothing! Also it has an amazing modding community constantly improving the game.