Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
PyMOL is an OpenGL based molecular visualization system
PyMOL is a Python-enhanced molecular graphics tool. It excels at 3D visualization of proteins, small molecules, density, surfaces, and trajectories. It also includes molecular editing, ray tracing, and movies. Open Source PyMOL is free to everyone!
Ayam is a free 3D modelling environment for the RenderMan interface.
RawKee: an Open Source X3D File Format Plug-in for Alias' Maya 3D Authoring Software.
Eloquent is a powerful Bible study tool for Mac OS X, supporting features such as services, to access the Bible in any program. It uses the Sword Library to work with bible texts, commentaries, dictionaries.
Earth orbits and coverage display in 3D on your laptop.
SaVi - simulate Iridium, Globalstar, O3b, Sirius Radio, GPS, Galileo and other satellite constellations, modify them, or design your own. Uses Tcl/Tk and Unix libraries; 3D viewing option requires Geomview running on X Window.
3D rendering and scene graph library
High-level 3D graphics library. Supports retained and immediate mode rendering, an extensible file format, plug-in renderers, a wide range of high level geometries, hierarchical models, and a consistent and object-orientated API.
BrickDraw3D is a MacOS program for building with virtual Lego bricks. It is based on the LDraw parts library and is useful for viewing and editing models in the DAT format. See http://olson.pair.com/brickdraw3d/ for examples.
Infinite Space is a 3D game engine. Its primary features include OpenGL support, thread-based objects, integrated AI scripting, multiplayer support and broadband voice communications.
JimboVector 3D is a suite of applications and source code which allow 3D application developers to easily implement complex 3D items into their projects. Such items would include character animations and physics, 3D maps, realtime 3D animated cutscenes,
A suicidally ambitious cross-platform reimplementation of UnrealEd and its derivatives.
bEngine is an open source OpenGL-based multiplatform graphics engine.