A layer built on top of the Insight Toolkit (ITK)
Img is a collection of format handlers for the Tk photo image type.
Open Source Solid Modeling CAD
Draw vector graphics to scale using a descriptive language
Earth orbits and satellite coverage display in 3D on your laptop.
Doing 3D with Tcl
PyMOL is an OpenGL based molecular visualization system
Panda3d to Tcl bindings
A C extension to Tk that provides functionality to modify images
Bulk Downloader for selectable Images (even Google Images)
domes, vaults and eggs - program to create 3D models and plans
Image viewer for animated GIFs
A Tcl/Tk widget for OpenGL rendering.