Typesetting values with units requires care to ensure that the combined mathematical meaning of the value plus unit combination is clear. In particular, the SI units system lays down a consistent set of units with rules on how they are to be used. However, different countries and publishers have differing conventions on the exact appearance of numbers (and units). A number of LaTeX packages have been developed to provide consistent application of the various rules. The siunitx package takes the best from the existing packages, and adds new features and a consistent interface. A number of new ideas have been incorporated, to fill gaps in the existing provision. The package also provides backward-compatibility with SIunits, sistyle, unitsdef and units. The aim is to have one package to handle all of the possible unit-related needs of LaTeX users.

This package, which works both for Plain TeX and for LaTeX, defines the \ifPDFTeX, \ifXeTeX, and \ifLuaTeX conditionals for testing which engine is being used for typesetting. The package also provides the \RequirePDFTeX, \RequireXeTeX, and \RequireLuaTeX commands which throw an error if pdfTeX, XeTeX or LuaTeX (respectively) is not the engine in use.

The l3kernel bundle provides an implementation of the LaTeX3 programmers interface, as a set of packages that run under LaTeX2e. The interface provides the foundation on which the LaTeX3 kernel and other future code are built: it is an API for TeX programmers. The packages are set up so that the LaTeX3 conventions can be used with regular LaTeX2e packages.

This package provides the German version of A Short Introduction to LaTeX2e: LaTeX2e-Kurzbeschreibung.

This package provides a French translation of the l2tabu practical guide to LaTeX2e by Mark Trettin. It focuses on obsolete packages and commands.

This package provides two shorthands for typesetting breaking and non-breaking small spaces, where both hyphenation and kerning against space are correctly applied. Additionally, interword kerning can be applied.

The package provides a means of producing a book of font samples (for evaluation, etc.).

The swung dash (U+2053) is a useful character traditionally used in typsetting dictionaries, but not supported by most typefaces. This package provides one simple command to typeset a swung dash in XeLaTeX and LuaLaTeX, by applying transformations to the given font's glyph for a tilde.

This package provides a document class for the open-access journal Philosophy and the Mind Sciences.

This is a XeLaTeX template for writing theses to apply academic degrees in Xidian University. The template is designed according to the official requirements on typesetting theses. The template currently supports all levels of degrees from bachelor to doctor, including both academic master and professional master.

This exam class is specially designed for mathematics teachers in China. Using BHCexam you can separate the format and the content very well; export both teacher paper and student paper; typeset multiple choice questions with 3-6 options keeping adaptively neat alignment; typeset cloze questions with a customizable underline; typeset questions with subquestions in lists; group questions in a list to control whether to show score, leave spacing, initialize question number; and more.

The package offers a means to set up hyphenation suitable for several languages and/or dialects, and to select them or switch between them while typesetting.

The package offers macros for making posters and banners with TeX. It is compatible with most TeX macro formats, including Plain TeX, LaTeX, AmSTeX, and AmS-LaTeX. The package creates a poster as huge box, which is then distributed over as many printer pages as necessary. The only special requirement is that your printer not be bothered by text that lies off the page. This is true of most printers, including laser printers and PostScript printers.

The package provides a diagram environment. This allows the LaTeX user to easily create complex commutative diagrams, by placing formula nodes on a conceptual grid and attaching arrows to them.

This package provides a LaTeX beamer template designed for researchers of Chongqing University. It can be used for academic reports, conferences, or thesis defense, and can be helpful for delivering a speech. It should be used with the XeTeX engine.

This a PSTricks package that provides support for drawing moderately complex UML (Universal Modelling Language) diagrams. (The PDF documentation is written in French.)

The bundle offers versions of the standard LaTeX article and report classes, rewritten to reflect a more European design, and the a4 package, which is better tuned to the shape of a4 paper than is the a4paper class option of the standard classes. The classes include several for article and report requirements, and a letter class. The elements of the bundle were designed by members of the Dutch TeX Users Group NTG.

The package provides the language definition file for support of Piedmontese in Babel. Some shortcuts are defined, as well as translations to Piedmontese of standard LaTeX names.

LuaTeX is an extended version of pdfTeX using Lua as an embedded scripting language. The LuaTeX project's main objective is to provide an open and configurable variant of TeX while at the same time offering downward compatibility. LuaTeX uses Unicode (as UTF-8) as its default input encoding, and is able to use modern (OpenType) fonts (for both text and mathematics). It should be noted that LuaTeX is still under development; its specification has been declared stable, but absolute stability may not in practice be assumed.

This package provides a LaTeX class for typesetting letters conforming to the official Corporate Image guidelines for the Politecnico di Torino. The class can be used for letters written in Italian and in English.

The package contains commands for students and teachers of introductory physics. Commands for physical quantities intelligently handle SI units so the user need not do so. There are other features that should make LaTeX easy for introductory physics students.

This package may be used to define the last point where some code shall be executed.

This package extends the existing LaTeX picture environment, using the familiar technique (the graphics and color packages) of driver files (at present, drivers for dvips, pdfTeX, LuaTeX, XeTeX, VTeX, dvipdfm, and dvipdfmx are available). The package documentation has a fair number of examples of use, showing where things are improved by comparison with the LaTeX picture environment.

\tokmap <command> { <tokens> } applies command over the token list tokens. Space tokens, left and right braces are replaced with the marker tokens \tokmap@space, \tokmap@bgroup, and \tokmap@egroup respectively. For convenience, command may contain multiple tokens.