I been playing a game on steam early access that is a strategy space mmo. Only fault with it turns can go slow because of waiting for other players. It's also F2P and has active devs.
http://store.steampowered.com/app/574070/Space_Wars_Interstellar_Empires/
http://store.steampowered.com/app/574070/Space_Wars_Interstellar_Empires/