Flexible level editor
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
3D engine with modern graphics
Java3d scenegraph editor
Modern 3D engine and IDE written using C# and C++.
Pear3DEngine is a modern and modular 3D development framework
A 2D Side Scrolling Platformer Game
Add-ons for the 3D Terrain & Landscape Editor Artifex Terra 3D
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor
SmartMap is an easy desktop random world creator.