FlightGear Flight Simulator: free open-source multiplatform flight sim
3D Engine c++
Open Source Solid Modeling CAD
Tools to process and visualize scientific data and images
Doing 3D with Tcl
A simple 3D framework in C++
Earth orbits and satellite coverage display in 3D on your laptop.
CIRT - CUDA Interactive Ray Tracer
C++ header-only library that simulates GLSL math
realistic driving simulation + functions for 2D/3D graphics
A project that has moved to GitHub
3D Without Boundaries