Helix Toolkit is a collection of 3D components for .NET
An STL model viewer, editor, and creator for manipulating STL files.
3D .NET engine for Windows, Linux, Mac
XNA based game engine completely written in c#
Framework for product designers of accessible product interfaces
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor
A modern 3D App framework using OpenCL to render via raytracing