Vivid3D is a C++ IDE/3D engine, with python scripting.
Take full control of your Windows Desktop background!
HARFANG 3D source code public repository
Tiny OpenGL Wrapper / 3D Engine in C++
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Realtime 3D engine for game development
C/C++ library to add light and intuitive GUI to OpenGL and DX programs
Computer vision and image processing library for Qt.