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!
The Pure Data (short Pd) project on SourceForge unifies the extensions (or externals) written for the Pure Data Graphical Computer Music System written by Miller Puckette with contributions from many others.
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.
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.
Lamia or Lamia Engine is the modern generation free distributable and open source game engine for creating computer games for several prevailing software platforms and very maybe hardware platforms either.
tkBacktracer is a cross-platform interactive visualization tool to explore the tool motions in RS-274D "G-code" CNC files used in computer controlled milling and manufacturing.
Fluent Engine is a cross-platform engine of virtual worlds, standing on the bleeding edge of technology. There are flexible GUI, scripting system, sound support and much more. Fluent Engine use all of the best technology from OpenGL or DirectX.
It is an extension of Wish to Tcl/tk and includes a new widget called glview. Each glview widget can draw a 3D view and does OpenGL work in Tcl/Tk, a high-level language, if Tcl is Operating System independent then we can build OpenGL applications independent of the operating system.
Dynamically loadable modules for TclTk, Perl, Python to ease the task of building custom 3D modellers and rendering engines.
Realtime 3D game/visualization engine, written in C++, scriptable through Tcl/Tk, Python and Lua. Supports D3D and OpenGL for rendering, runs under Linux and Windows.
gMax graphic tools for jMax
Ayam is a free 3D modelling environment for the RenderMan interface.
3D Motor Sports Simulator