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diaglib - a Tcl library for creating and editing diagrams

Note: I don't use this anymore! Now I create diagrams using dednat4.
Back in '99 when I needed to draw some category theory diagrams for my master's thesis and XYpic seemed impossible to learn I wrote a quick hack in Tcl/Tk to let me program diagrams instead of just editing them... for example, in this diagram about a certain way to compose natural transformations all coordinates are calculated from the coordinates of a few "anchor objects":
The diaglib source for the diagram above (all my other diaglib diagrams are in the same file).
The library in Tcl/Tk; the code that creates a text object, the code that makes a text object draggable.
An old page about it.
There's a bit more about diaglib at my little languages page.

Two expect scripts are part of eev: eegchannel, eeg4

(Warning (2005sep08): most of the rest of the page is several years old. Expect broken links and broken meanings.)

Don Libes's Exploring Expect is one of the very few computer books that is worth its salt (and more). It is non-free, though, and the free on-line docs are hard to use.
...but with eev it is possible to create hyperlinks to positions in the Expect manpage. The syntax is like this:
- # (find-expcommand "trap [[command] signals]")
- # (find-expcommand "send [-flags] string")
The Tcler's Wiki
My pages on Tcl and MkTclApp.
eeg4, a script that lets eev control arbitrary console-based interactive programs.
I have converted Expect's manpage to TeXinfo format; here is the .texi, and here is the top node of info document (thanks to info2www).
Expect scripts for relating with modems in Linux:
- A shell function to connect to a free ISP
My e-scripts on Expect, Tcl/Tk, and mktclapp; and the beginnings of a Tcl tutorial (in Portuguese) using eev.