What: Nanocad

 Description: A Chemistry CAD program which allows you to create 
        small molecules and rotate them.
 Updated: 11/1997
 Contact: mailto:[email protected] (Will Ware) 

2005-05-10: Connection timed out

AM Here is a more up-to-date reference: but judging from the text, it has nothing to do with Tcl:

 "Up to now, previous versions of NanoCAD have been written in either Scheme or Common Lisp. 
 This has proved inconvenient for a lot of people, so this Java version"...

[Category Application - Category Chemistry - Category Science]