OgreWin3D
Vivid3D is a C++ IDE/3D engine, with python scripting.
Modern 3D engine and IDE written using C# and C++.
Lego Island 2 Game Editor
IRB is a game creation toolkit
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
evolution for vegastrike SpaceSim/Combat/Trade game
Animation graph editor.
Built to be ease of use, with no programming knowledge, Multi-platform
3D Game engine
Multi-threaded 2D Renderer licensed under the Mozilla Public License
A 2D tile map editor created using .NET framework.
Phobos editor is a generic resource editing system.
Pear3DEngine is a modern and modular 3D development framework
cross-platform 2d game engine
Sourceport of the classic Descent Level Editor
AMOS BASIC reimplementation in Java