Elemental: Fallen Enchantress

This game is a 4x turn based strategy and it is hella fun. Sadly it is still in beta, not so sadly it is only 4 days until release and if you buy it from Steam you get immediate access to the beta. There are a couple bad things though. The game still has crashes even though it's only 4 days away from release, there will be no multiplayer on launch (they said it might be added later), and there are still little things that happen to not make the game feel as good as it can be. It is a really great game, flaws and all. You should look into picking it up.

http://store.steampowered.com/app/216390/

I forgot to mention the amazing mod tool's they're releasing for it.