The open-asset-importer-library repository
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
C++ header-only library that simulates GLSL math
Gphoton in a simple 3d modeler and ray tracer.
Free vector,quaternion,matrix math library
Multi-Language Wrapper Collection for the Irrlicht Engine
A 3D rendering / entity engine
Obsolete: use https://github.com/VMML/vmmlib