TeX is a free typesetting system for which many extensions have been developed. Languages ArabTeX – adds support for Hebrew and Arabic alphabets FarsiTeX – adds support for Farsi Omega (TeX) – extends multilinguality by using the Basic Multilingual Plane of Unicode XeTeX – uses Unicode, adds additional fonts TIPA (software) – supports phonetic characters CTeX – Chinese TeX MonTeX – Mongolian LaTeX Science AMS-LaTeX and AMS-TeX - classes and packages developed for the American Mathematical Society; extensions of LaTeX and TeX respectively CircuiTikZ - adds creation of electrical networks (adds on to TikZ) REVTeX - collection of LaTeX macros used for scientific journals XyMTeX - supports chemical structure diagrams General BibTeX - adds reference management software ConTeXt - general-purpose document processor LaTeX - collection of macros written by Leslie Lamport LuaTeX - all internals can be accessed from Lua pdfTeX - outputs PDF files directly Other MusiXTeX - allows music typesetting Gregorio - allows typesetting of Gregorian chant PGF/TikZ - languages that provide vector graphics PSTricks - allows using PostScript drawings Texinfo - used for software manuals, can produce both print and Web documentation) See also CTANComprehensive TeX Archive Network References TeX TeX