I wrote a short program in Icon to make it easier to typeset deduction trees. It converts files with trees drawn in beautiful ascii art, like this and this, into ugly stuff that TeX understands, like this and this). I used this a lot in my thesis and never quite had the nerve to document it... if you plan to use it you will certainly need some other files from my home machine.
My first Tcl/Tk program was something to edit the diagrams that appear on my thesis... Here it is: diaglib.013, LATEX/basiclib.013. Here is a file with the code for the actual diagrams; I use the function eediag-bounded (bounded to F3) to launch a diagram into ee.
