Epic Games
houses repositories associated with the UnrealEngine
Unreal Engine for game development is free to get started (a 5% royalty only kicks in when your title earns over $1 million USD)
To access our repositories, sign up for an Epic account at UnrealEngine.com and register your GitHub ID using these instructions.
After that, you can find our repositories here:
(Note that you must be signed into GitHub for these links to work.)