Helix Toolkit is a collection of 3D components for .NET
Ultraleap SDK for Unity
Stride (formerly Xenko), a free and open-source cross-platform C# game
Google Cardboard XR plugin for Unity
C# graphics library used for 3D modeling, built with OpenGL/OpenTK
Vivid3D is an open-source 3D engine with powerful 2D UI.
Accelerate cross-platform MR app development in Unity
Virtual Reality tool for storytelling
Modern 3D engine and IDE written using C# and C++.
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Dependency Injection Framework for Unity3D
3D .NET engine for Windows, Linux, Mac
XNA based game engine completely written in c#
Free 3D Photo Maker. Make 3D content yourself!
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor