FlightGear Flight Simulator: free open-source multiplatform flight sim
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
High-efficiency minimalist C++ wrapper for OpenGL 4.3
CIRT - CUDA Interactive Ray Tracer
Support for legacy OpenGL in core profiles
crossplatform multithreaded object-oriented render and audio engine
C++ Frontend for the RenderMan Interface
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Tao3D is a programming language for real-time interactive 3D
A tool that uses OpenCL to procedurally generate 3D models
Program for drawing 3D surfaces from parametric equations
.NET wrapper for the Irrlicht Engine
Perl bindings to the Modern OpenGL API
realtime 3d surface rendering library
Imagin Raytracer is a multithreaded command line raytracer
simple 3d scene viewer for windows/linux/android
Semiautomatic generation of semantic building models from image series
3D game engine for C and C++
Pear3DEngine is a modern and modular 3D development framework
true 3D Labyrinths - generating, rendering, exploring, building
Multi-Language Wrapper Collection for the Irrlicht Engine
In-flight navigation (and more) for private pilots (Linux).