UNITY

Home page: http://unity3d.com

Documentation: http://unity3d.com/support/documentation/

Tutorials: https://unity3d.com/learn

Mastering Unity Scripting (UVU Safari Books Online) This book includes a chapter on using Git with Unity.

Unity in Action: Multiplatform game development in C# with Unity 5 (UVU Safari Books Online)

Getting Started with Unity 5 (UVU Safari Books Online)