support for preparing e-books
editor designed (or adapted) for use with (La)TeX
plug-ins for editors, for better (La)TeX and Meta* support
editor’s marks, highlights, etc.
ensure consistency of usage
support of electronic design
code to emulate “other things”
conversion between encodings
notes typeset at end document
TeX (or TeX-alike) typesetting engine
typesetting associated with engineering of whatever sort
typesetting specific to English
examine the TeX programming environment
short quotation typically associated with the start of a chapter
control of LaTeX error messages
support for typesetting Esperanto
course work essays, assignments, etc.
support for typesetting Estonian
exams, quizzes, etc.
execute ‘other types’ of language
exercises, problems for solution, etc.
offer of a facility that may never make its way to production use
package uses experimental LaTeX 3
run an external program from within a document
link to a service not on CTAN