LaTeX is a document preparation system for high-quality typesetting based on TeX. It is most often used for medium-to-large technical or scientific documents, but it can be used for almost any form of publishing. It is not a word processor; instead, it encourages authors not to worry too much about the appearance of their documents, but to concentrate on getting the right content.
svninfo is used to extract the revision and file information provided by the Subversion revision control system. To present the version information of a document, one needs to extract it from some kind of text inserted by the revision control system. Subversion offers therefore the Id keyword, which is expanded by the Subversion update command and contains a lot of useful information. This information is made available through this package.
prerex is an interactive (command-line) editor and a LaTeX macro support package that can be used to create very attractive and readable prerequisite charts. A graphical front-end for the editor also provides a prerex-enabled PDF viewer. A prerequisite chart is a network of course boxes linked by prerequisite and co-requisite arrows.
TeXcount is a Perl script for counting words in LaTeX documents. It parses valid LaTeX documents counting words, headers, formulae (mathematics), and floats/begin-end groups. To run the script, you can either download it and run it on your own computer, or you can use the Web interface. TeXcount is included in the CTAN TeX/LaTeX archive, and thus included in several TeX distributions. If you have TeX installed, chances are you may already have TeXcount.