itch.io

Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

Things made with or for the open source 3D modeling software, Blender

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

Games that feature 3D art that has a low polygon count per model. Generally used as an artistic style.

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