42 Moddable · Sci-fi games your group can play together online, including Heroes of Science and Fiction, Age Of Warbots, and Emperor of the Fading Suns Enhanced.
All games: 24
A turn-based sci-fi strategy that combines exploration and exciting clashes on the battlefield. Take control over several different species, raise powerful armies for your heroes and destroy your opponents! This HoMM-like is set in a scifi universe, with new mechanics on top of the classic formula.
A sandbox battle simulator game where you can build your own shape-shifting warbots, program their AI, and watch them smash each other up on the battlefield! Join the battles yourself by taking control of the warbots! Use Steam Workshop to check out warbots created by players from around the world!
Command interstellar forces in this epic return of the 4X strategy classic. From planetary politics to galactic warfare, the stakes couldn’t be higher as you lead your Royal House through battles on land, sea, air, and the vast reaches of space.
The world has ended. You are deep underground, and all alone with a cheery AI companion. You will have to mine and build to survive, and search for other survivors to help you. Will you be able to reach the surface? And what will you find when you get there?
Barotrauma is a 2D co-op submarine simulator – in space, with survival horror and RPG elements. Steer your submarine, complete missions, fight monsters, fix leaks, operate machinery, man the guns and craft items, and stay alert: danger in Barotrauma doesn’t announce itself!
Final Factory blends factory building, spaceship design, and a rich universe to explore. Build a mega factory and command a massive fleet against the hostile local aliens. Discover new technologies and unlock the secrets of an ancient civilization as you explore an infinite cosmos.
The spiritual successor to Freelancer with a Lovecraftian, sandbox RPG twist. Explore a vast handmade universe with mod support and PvP/co-op multiplayer. You're going to need a bigger ship.
Take command of a civilization that has just achieved faster-than-light travel in Galactic Civilizations IV, the newest entry in the award-winning space 4X strategy game series. Explore the galaxy, colonize worlds, shape cultures, make alliances, fight wars and pioneer new technologies.
Take command of your hand-tailored fleet of space warships and use realistic radar, electronic warfare, advanced movement controls in 3D space, and precision targeting to outmaneuver and outwit your opponents in a simulation-heavy tactical space game like no other.
SYNTHETIK 2 is a unrelenting tactical-shooter rogue-lite. Play alone or with friends. Loot powerful tech. Experience the next level in gun-play. Upgrade your androids to rival the machine gods!
Make Mars your own! Take control of the world’s most sophisticated AI (AMI) and terraform the surface of the Red Planet for a city-building experience on a planetary scale. Transform this barren world into a lush paradise and explore the surface for any ancient secrets that may be waiting.
An open-ended factory management game with RTS and tower defense elements.
A tactical roguelike RPG inspired by our favorite tabletop games that lets you create any ability, item, villain, hero, and game imaginable.
The most devious and acclaimed artificial intelligence in strategy gaming is better than ever. A grand strategy/RTS hybrid that reverses many conventions of both genres. Take territory without attracting attention, build your empire with care, and adapt to an ever-evolving galactic battleground.
Fight the greatest battles in the STAR WARS universe any way you want to. The choice is yours.
The Hokuta City streets await your engine rev. Can you beat everyone in this race for first place? Upgrade your car, take care of its appearance and defeat everyone on the streets of the Hokuta City.
Go on a trip through time! Experience the freedom of traveling into any date, hour and minute in time between the years 1 and 3033 AD! Help your best friend Edward in his scientific affairs! Watch out for the Time Agents & avoid yourself!
BallisticNG is a high speed, all thrills anti-gravity combat racer and open modding environment developed as a tribute to old school classics such as Wipeout, Rollcage and Jet Moto.
Contribute to the colonization of the universe. Get and process resources, develop your technologies. Achieve complete automation and build a portal to include another planet in the chain of worlds.
Stationeers puts you in control of the construction and management of a space station to run by yourself or online with your friends. Complex atmospheric, electrical, manufacturing, agriculture, and gravitational systems require your thought and management at all times!
Star Control is a space role-playing game in which you command Earth's first interstellar starship on a mission to save the Earth from hostile alien empires.
Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics.
ENDLESS Space™ 2 is a Strategic Space Opera, featuring the compelling “just one more turn” gameplay, set in the mysterious ENDLESS Universe™. As the leader of your civilization, will you impose your vision and build the greatest stellar empire?
A massive-scale real-time strategy game where you command entire armies on a dynamic battlefield. Conquer multiple worlds across several single-player campaigns; or play with your friends in multiplayer combat.