A game framework written with osu! in mind.
Vivid3D is an open-source 3D engine with powerful 2D UI.
Small lightweight program to customize your keyboard
Modern 3D engine and IDE written using C# and C++.
Reactive extensions for Unity
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
3D .NET engine for Windows, Linux, Mac
c# lua bind with unity3d project for game development
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
Investigo - DX9 Performance and Debugging Toolkit