crossplatform multithreaded object-oriented render and audio engine
A simple 3D framework in C++
Vivid is a modern C++ 3D engine using OpenGL4+
Audio spectrum visualiser in 3D for Linux
3D .NET engine for Windows, Linux, Mac
3D game engine for C and C++
Pear3DEngine is a modern and modular 3D development framework
Minimalist 3D Scenegraph Management Framework
Collections of abstractions for Pure Data
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor