Img is a collection of format handlers for the Tk photo image type.
Open Source Solid Modeling CAD
Doing 3D with Tcl
Earth orbits and satellite coverage display in 3D on your laptop.
PyMOL is an OpenGL based molecular visualization system
A C extension to Tk that provides functionality to modify images
Image viewer for animated GIFs
A Tcl/Tk widget for OpenGL rendering.