Open game and rendering engine packed into a JavaScript framework
Vivid3D is a C++ IDE/3D engine, with python scripting.
OgreWin3D
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Updated emulator of Forgotten Realms: Unlimited Adventures
Modern 3D engine and IDE written using C# and C++.
A 2D game engine and level editor
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
evolution for vegastrike SpaceSim/Combat/Trade game
3D Game engine
Open Source Virtual World and MMOG Development Platform
cross-platform 2d game engine
AMOS BASIC reimplementation in Java
Python game template