Powerful, mature open-source cross-platform game engine for Python
Voxel game engine in C++ with OpenGL
Solar2D Game Engine main repository (ex Corona SDK)
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
3D Game engine with editor
Here we're trying to create the easiest open-source game engine.
Injectable LUA scripting system, SDK generator, live property editor
Python ctypes module for the Irrlicht Engine SDK
Amazon Lumberyard is a free AAA game engine
Educational framework for OpenGLES, OpenCL and OpenAL