Modern 3D engine and IDE written using C# and C++.
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
3D .NET engine for Windows, Linux, Mac
Real-time interactive erosion simulation. Created in Unity 5.
Toolbox for geoscientists and geo enthusiasts
XNA based game engine completely written in c#
An expanded XNA game creation framework
Azmyth Game Framework
A 2D Side Scrolling Platformer Game
Easy Terrain editing and Heightmap creation
DREAM is an Open Source GCS
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor