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
A real-time 3D engine for DOS-talgics (see GLOBE_3D for new stuff !)
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+
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Sorry this project is no longer being supported
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Game engine supporting many 3D/2D formats and graphic effects