Avogadro libraries provide 3D rendering, visualization, and analysis
aka ogre v2 - scene-oriented, flexible 3D C++ engine
LDraw™ editor for LEGO® style digital building instructions.
Realtime raytracer using SIMD on ARM, MIPS, PPC and x86
Rayshade raytracer
Vivid is a modern C++ 3D engine using OpenGL4+
A react renderer for blessed
Compose render props components like a pro
3D .NET engine for Windows, Linux, Mac
https://github.com/horde3d/Horde3D
Bruno's RAY Tracing Engine