itch.io

Utilizing content created by algorithms rather than human made content. Often utilizes a "seed," a relatively small string that is used to control the randomization algorithm that generates the entire world.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Subgenre of Horror, where player's character is usually more vulnerable and under-armed, usually focusing on evasion, stealth and/or puzzle-solving, rather than combat.