Sins of a Solar Empire is a real-time space strategy and the first chapter in an epic science fiction saga. The independent Trader Worlds must unite and form the Trader Emergency Coalition to defend themselves against the return of their exiled brethren, "The Advent" and the arrival of the desperate remnants of the ancient Vasari Empire. Explore and conquer nearby planets and distant solar systems by applying brute force, cunning strategy, elegant diplomacy, economic mastery, and researched technology. The gameplay features seamless transition between epic strategy and tactical combat modes.
Sins of a Solar Empire: Trinity finally arrives on Steam! - 25% off until November 23rd 10AM PST!
Posted by Orrie on Nov 17th, 2011

Sins of a Solar Empire: Trinity is Now Available on Steam and 25% off until November 23rd 10AM PST.
In Sins of a Solar Empire: Trinity, you are the leader of a civilization embroiled in a galactic war, fighting for the survival of your entire race against relentless foes. Your success will depend entirely on your ability to manage your empire and command your vast fleets of starships to victory.
Source:
Store.steampowered.com
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Bought it on steam and enjoying every minute of it :)
for some reasons mods don't work for me the steam version of trinity