Unreal Engine Official Tutorials
Complete resources for learning to use Unreal Engine 4
6 Alternatives To Unreal Engine Official Tutorials
Duality
A 2D game development framework.
FlatRedBall
Cross-platofrm 2D game engine using C#, focused on developer productivity, transparency, scalability, and ease of use.
MonoGame
MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
UDK
Unreal Engine 3 is a complete game development framework that operates across 10 platforms. Provides a vast array of core technologies to creating high-quality games and applications.
Unity3D
Unity is the ultimate game development platform. Use Unity to build high-quality 3D and 2D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers.
Wave
Wave makes it easy to be your own boss.