[lsaferite]

Actually, in abstract the idea of a game with no 'game' but just engine with full mod support sounds interesting.

I guess that's what things like second life covered though.

One game that I love that has very little in the way of story is Don't Starve. It has a great mod system that uses Lua to provide so pretty amazing mods to the base game. Basically the entire game is written using the mod system with only the lowest level engine parts being compiled code.