FlightGear Flight Simulator: free open-source multiplatform flight sim
Kokua is a V3 based open source metaverse viewer project.
An interactive viewer for three-dimensional chemical structures.
3D fractal rendering software
Open Source Solid Modeling CAD
DirectX 8 to OpenGL wrapper for legacy apps and portability
Tools to process and visualize scientific data and images
Interactive 3D Layout Viewer for GDSII
LDraw™ editor for LEGO® style digital building instructions.
A real-time 3D Engine written in Ada
Xj3D is an open-source Java codebase for the X3D Graphics standard.
Doing 3D with Tcl