perform calculations within TeX.
typeset calendars, diaries, planning charts, etc..
call external code and process the result.
typesetting ‘flash’ cards for teaching and learning.
cards for miscellaneous purposes.
map production and geographical data usage.
documentation in and support for typesetting Catalan.
typeset catalogue data.
support for LaTeX(-alike) on the web, or feeding into other applications.
chemistry document support.
support for typesetting Cherokee.
support for typesetting Chinese languages.
documentation in Chinese languages.
chord notations, as for song books.
extract chunks of a document for separate processing.
support for typesetting Church Slavonic.
citations in footnotes.
alternative LaTeX class(es).
export features from a class for use elsewhere.
support for class (and package) development.
improve the appearance of LaTeX code.
a collection of packages.
typesetting in colour.
control TeX’s behaviour during compilation.
typeset computer network concepts.
typeset computer-science related material.
support for preparing documents.
typeset theoretical computer science material.
compact output, typically multiple pages/sheet.
the document compilation process.
typesetting conference proceedings.
macros of, or for use with, ConTeXt.
documentation of ConTeXt.
typesetting cooking recipes, etc.
support for typesetting coptic.
management of counters.
typeset badges, covers or labels for things (or people).
typeset scholarly editions of texts.
support for typesetting Croatian.
typeset material to do with crystallography.
Read, process and convert CSV data.
support for work with the CTAN archive.
generate HTML from TeX-ish sources.
convert TeX-ish sources to some other markup (than HTML).
support languages written using Cyrillic alphabets.
support for typesetting Czech.
documentation in Czech.