Vivid3D is an open-source 3D engine with powerful 2D UI.
Small lightweight program to customize your keyboard
Reactive extensions for Unity
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
3D .NET engine for Windows, Linux, Mac
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
c# lua bind with unity3d project for game development
3D Game engine
A cross-platform game framework based on OpenGL and GObject.
An open source skateboard games engine written in C# and .NET.
Open Source Virtual World and MMOG Development Platform
An extensible development framework for roleplay games.
Pokemon project made in vb.net with 2D version.