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

Games where you have to manage resources in order to complete objectives. 

Containing resources for creating music and audio. Spanning sound effects, music packs, software tools, and educational materials focused on audio creation.

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