Endless Space

From the game's official website:

Guide one of eight civilizations as you strive for galactic domination.
Control the entire galaxy through subtle trade and diplomacy.
Explore every corner of the universe to find powerful artifacts and resources.
Overwhelm other civilizations with your advanced technologies.
Destroy your enemies with massive armadas.

Explore hundreds of star systems and master the mysteries beneath the Dust.
Exploit different planet types, luxuries and strategic resources.
Confront a host of strange scientific phenomena.
Hire heroes to become fleet admirals or system governors.
Discover five hero classes and their unique ability trees and specializations.

Experience Endless Space with state-of-the-art graphics and interface.
Switch between strategic battle decisions and long-term planning.
Optimize each fleet for epic battles around contested stars.
Create the perfect combinations from dozens of unique ships per civilization.
Customize your ships with modules, armament, engines and special mods.

Play against up to seven opponents and build up - or break - alliances at will.
Discover an innovative and dynamic simultaneous turn-based gameplay.
Permit instant jump-in for your ongoing online games.
Define your own custom civilizations and confront the ones created by your friends.

Control every new game's scope, from a quick match-up to an endless war.
Generate an infinity of galaxies where every start begins a new adventure.
Modify the size, shape, density, age and a lot more to create your ideal galaxy.
Choose from different victory conditions and adapt your strategy on the fly.