Spacebase Startopia captivates with its original mixture of economic simulation and empire building strategy paired with classic RTS skirmishes and a good dose of humor.

One of the greatest sci-fi strategy games of all time returns with remastered visuals, online multiplayer and near unlimited mod content from Steam Workshop. Experience thrilling first person action and acclaimed RTS in this explosive alternate vision of the 1960s space race.

Become the captain of a interstellar cruiser and cross the galaxy to save the Republic. During your journey you will have to make important decisions, improve the weaponry of your ship and fight against numerous enemies.

The most scientifically accurate space warfare simulator ever made. Now with Steam Workshop!

In this turn-based strategic artillery game, players wage interplanetary wars by developing their home planets and firing massive barrages through the unpredictable gravity fields of the solar system.

Fight for control of a frontier world. Gather resources, build your base, and command your forces in battle. Survive long enough to unleash your ultimate weapon - THE EPIC.

Infinifactory is a sandbox puzzle game by Zachtronics, the creators of SpaceChem and Infiniminer. Build factories that assemble products for your alien overlords, and try not to die in the process.

Reintroducing a classic from the golden era of gaming, the original empire building space RTS, Imperium Galactica 2 is back and looking better than ever with new high-res textures and vivid colors.

Get the complete GalCiv II saga including Galactic Civilizations II: Dread Lords, the expansion pack Dark Avatar, and the newest expansion pack Twilight of the Arnor!

Battlezone: Combat Commander remasters FPS-RTS classic Battlezone II with slick new visuals, brand new achievements, Steam Workshop support and much more! The solar system is at war. Take command.

Play as humans or robots in a brand new sci-fi strategy adventure! Travel into the far reaches of space, through cleverly designed star constellations and variable game modes, conquering enemy planets using 15 combinable technologies.

Interstellar Space: Genesis is a turn-based space 4X strategy game in which you attempt to build a thriving galactic empire. Discover mysteries among the stars, colonize worlds, and engage enemies in tactical turn-based combat on your journey to becoming the ruler of the galaxy!

Strategy from the front lines! Starpoint Gemini Warlords combines 3rd person capital spaceship combat with 4X strategy and RPG gameplay elements. Build mighty war fleets and send them into battle or lead them into combat yourself. Become the Warlord and conquer the Gemini system!

Forge an empire in a universe where population growth is stripping away planetary resources. Colonize unknown planets and trade with other races for their knowledge.

Doomsday is a sci-fi interstellar war strategy online game.

Your heroes and your armies will need strong leadership to take them on a spellbinding odyssey that has everything a gamer’s heart could wish for breathtaking worlds in space, battles against cunning enemies and even downright treason from your own government faction - are you up to it?

Pilot drones into derelict spaceships to find the means to survive and piece together how the universe became a giant graveyard.

Gaia Project is the digital adaptation of the boardgame Gaia Project created by Helge Ostertag and Jens Drögemüller and published by "Feuerland Verlag". It is a 1-4 player strategy game. It plays in the same universe as Terra Mystica and continues the adventure in the far future.

After the destruction of the EARTH in 2150, the leaders of the Eurasian Dynasty escaped on board an evacuation fleet. Now they are fighting for the survival of the human species. Their base is one large building comprising of smaller variable parts.

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.