FlightGear Flight Simulator: free open-source multiplatform flight sim
An interactive viewer for three-dimensional chemical structures.
Realtime raytracer using SIMD on ARM, MIPS, PPC and x86
LDraw™ editor for LEGO® style digital building instructions.
Cross Platform Professional Procedural Terrain Generation & Texturing
Growth-grammar related Interactive Modelling Platform
Vivid is a modern C++ 3D engine using OpenGL4+
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Game engine supporting many 3D/2D formats and graphic effects