Alien: Isolation is described as 'Fifteen years after the events of Alien™, Ellen Ripley’s daughter, Amanda enters a desperate battle for survival, on a mission to unravel the truth behind her mother's disappearance'. There are more than 25 games similar to Alien: Isolation for a variety of platforms, including Windows, Steam, Mac, Playstation and Linux. The best alternative is Metro Game Series. It's not free, so if you're looking for a free alternative, you could try SCP: Containment Breach or Cry of Fear. Other Alien: Isolation like games are Dead Space (Paid), Thief (Paid), Amnesia: The Dark Descent (Paid) and Resident Evil (Paid).
SCP: Containment Breach is an indie survival horror video game based on the stories of the SCP Foundation website. The player guides a test subject, D-9341, through many obstacles inside of a facility belonging to the shadowy SCP Foundation.
After a secretive agency in New York is invaded by an otherworldly threat, you become the new Director struggling to regain Control in this supernatural 3rd person action-adventure from Remedy Entertainment.
Layers of Fear is an foray into madness, a first-person horror game that sets a tone of fear and dread through provocative story telling as you explore a Victorian setting complete with mood-setting art pieces.
Penumbra: Overture is the first in a series of episodic survival horror games developed by Swedish developer Frictional Games. It was originally intended as the first episode of a trilogy. Represent entire series of Penumbra games.