FlightGear Flight Simulator: free open-source multiplatform flight sim
2D & 3D TeX-Aware Vector Graphics Language
CIRT - CUDA Interactive Ray Tracer
itom - an Open Source Measurement, Automation and Evaluation Software
HARFANG 3D source code public repository
Rayshade raytracer
Tao3D is a programming language for real-time interactive 3D
Program for drawing 3D surfaces from parametric equations
Perl bindings to the Modern OpenGL API
3D .NET engine for Windows, Linux, Mac
realtime 3d surface rendering library
Imagin Raytracer is a multithreaded command line raytracer
C++ wrapper for the OpenGL (Version 3 and higher) API
OpenGL Image Processing LIBrary
TurboSphere is an easy to learn and powerful JS based game engine.