Macro package on top of TeX, written by Leslie Lamport (initially), that makes it much easier for most people to produce extremely high-quality typeset TeX documents. Has a huge number of extension packages that allow it to do things from reports to presentations to crosswords.

Useful links:

• TeX Users Group (TUG) homepage: http://tug.org/
• LaTeX3 Project homepage: http://www.latex-project.org/

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MC 2005-12-29: I've typeset a couple of books now and find that I get a lot of mileage out of getting my content into an XML format and then writing a Tcl script (making use of tDOM) to transform that into LaTeX. This allows me to easily experiment with LaTeX markup and LaTeX packages (since I've still got a lot to learn) with minimal pain.

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Donald Arseneau is quite active on both comp.lang.tcl and comp.text.tex newsgroups.

See also:

• calling pdflatex
• docstrip and tclldoc

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