OS Greentea is based on ReactOS™ project. Here you can see, that directory tree is kept the same to make fork syncing simpler.
This repo is only for developers.
Multiple licenses applied, but mostly considered to be a GPL-like project.
ReactOS™ is an Open Source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft® Windows™ NT family of operating systems (NT4, 2000, XP, 2003, Vista, Seven).
Please visit this link for more information https://github.com/GreenteaOS/Greentea
For credits, visit CREDITS file, github's list of contributors and our team page.