Avogadro libraries provide 3D rendering, visualization, and analysis
A modern library for 3D data processing
3D reconstruction software
The open-asset-importer-library repository
The open source mesh processing system
aka ogre v2 - scene-oriented, flexible 3D C++ engine
Real-time physically based rendering engine for Android, iOS, and more
Helix Toolkit is a collection of 3D components for .NET
3D GPUs Strange Attractors and Hypercomplex Fractals explorer
A real-time physically based 3D rendering engine for React Native
A python module for scientific analysis of 3D data
High-efficiency minimalist C++ wrapper for OpenGL 4.3
Doing 3D with Tcl
Open Source Solid Modeling CAD
3D fractal rendering software
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
A simple 3D framework in C++
Vivid3D is a C++ IDE/3D engine, with python scripting.