itch.io

Set in a fictional universe, often (but not always) with fantastic or supernatural elements, alternate worlds, magic and monsters.

Pretty sure everything is indie on itch.io but just in case you want something extra indie.

Containing digital representations of objects or characters. Often utilized for 3D printing, game development, animation, or virtual avatars.

Unity is a game engine for 2D, 3D, AR and more

Unreal Engine is a 3D game creation tool