Unification Wars is a free-to-play sci-fi MUD type of Massively Online Game by Gamestotal with over 350,000 members. You are the leader of an empire, recruit and level up your minister(s) to assist you to expand your economy, military and power by diplomatic or military means. Enslave all intelligent life to unify them all ! Features include research, explore, colonize, warfare, alien races etc.
Unification Wars hasn’t been updated in a while, so the current state of the game is uncertain.

Features

-124 technology, 70+ system types, 1000+ battle strategy, 20+ mega projects, 8+ alien races, 60+ artifacts
-Easy to use Clan options (Federations)
-300+ single player missions
-Multiplayer: Fight against 350,000+ players!