itch.io

Offering easy-to-understand mechanics and accessible gameplay, this category emphasizes relaxed, enjoyable experiences suitable for players of all ages and skill levels.

Things that are available on GitHub

Contains (or is themed around interacting with) a musical score, soundtrack, or backing track(s).

Products that involve or comprise source code, including programming games; does not refer to products with their own source code available, open source or not.

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

Resources for building and relating to User Interfaces, how the user interacts with your program