[Evilyeti]

I've made a list so far in the original post by your suggestions so far. Thanks guys.

I don't think Total Annihilation counts because it went from a retail game to a mod, although i guess that could be the same as a game going from a mod to a game.

I'm just trying to come up with a list of games we would not have without a modding community on PC. But to show the importance of a modding community i was mainly looking for games that went from Mod to Retail.