FTL: Faster Than Light is described as 'FTL is a spaceship simulation roguelike-like. Its aim is to recreate the atmosphere of running a spaceship exploring the galaxy (like Firefly/Star Trek/BSG etc.)' and is an game in the games category. There are six games similar to FTL: Faster Than Light for a variety of platforms, including Windows, Steam, Mac, Linux and Android apps. The best FTL: Faster Than Light alternative is Elite: Dangerous. It's not free, so if you're looking for a free alternative, you could try Pioneer. Other FTL: Faster Than Light like games are Crying Suns, Kerbal Space Program, Out There and Galactic Crew.
Elite: Dangerous is a space adventure, trading, and combat simulator that is the fourth release in the Elite video game series.
Crying Suns is a tactical rogue-lite that puts you in the role of a space fleet commander as you explore a mysteriously fallen empire. In this story rich experience inspired by Dune and Foundation, each successful run will uncover the truth about the Empire...
This is the closest alternative to FTL, imo.
Create and manage your own space program, build and fly spacecraft, and try to conquer space.
one is a game, the other a simulator
Pioneer is a space adventure game set in the Milky Way galaxy at the turn of the 31st century. The game is open-ended, and you are free to explore the millions of star systems in the game. You can land on planets, slingshot past gas giants, and burn yourself to a crisp flying...
Out There is a space exploration game blending resource management and gamebook with no combat. Its Pulp Comics graphics and its eerie soundtrack composed by award-winning composer Siddhartha Barnhoorn offer a unique sci-fi adventure tainted with loneliness.
Galactic Crew is a roguelike sci-fi exploration game. You and your valorous crew members will explore a galaxy far away, with all its dangers and riches.
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FTL plays nothing like Elite Dangerous.