Click on the title to list all pages relating to TeX and LaTeX.

Here's a possibly incomplete selection:

!TeX implementation:
* TeX
* LaTeX
* PdfTeX
* PDFLaTeX
* ConTeXt
* [[Texinfo]]
* BibTeX

!TeX and !LaTeX major modes:
* AUCTeX -- IDE for LaTeX
* UltraTexMode -- dynamic completion through LightningCompletion
* CDLaTeX -- minor mode, templates
* YaTeX -- Yet Another TeX mode for Emacs
* [http://www.ctan.org/tex-archive/help/Catalogue/entries/swiftex.html SwifTeX] -- created for doc.sty, derived mode

With a bit of EmacsLisp:
* RefTeX -- support for labels, references, citations and indices
* BibTeX -- bibliography in LaTeX, editing style files
* FileFormat -- edit with accented characters in the buffer, but sequences like <code>{\"a}</code> in the file
* [[Talcum]] -- unclutter, command insertion, refresh preview window after compilation
* PreviewLaTeX -- visualization of images, tables, math directly as images in the source buffer.
* TexMathPreview -- minimal previewing of <nowiki>TeX</nowiki> maths for TeX, [[Texinfo]] and WikipediaMode markup.
* LaTeXMathPreview -- a fork of tex-math-preview.el. making preview only for LaTeX.
* XSymbolMode -- assist input of symbols in some token languages; uses a special font to display math
* WhizzyTeX -- real-time updates in a separate preview window while you type
* LatexOverview -- describes how to get overview without AUCTeX
* LaTeXSymbols -- input of TeX symbols, XEmacs only
* LatexEnc -- coding system from <code>inputenc</code>
* TexSmartUmlauts -- automatic and persistent conversion of non-ASCII characters
* InverseDviSearch -- going from dvi preview to editor and vice versa
* NonbreakableSpace -- inserting nonbreakable spaces into document
* [[iTe]] -- A semi-WYSIWYG TeX mode, for in buffer manipulation of objects (images fragments)
* [http://gatxan.cimne.upc.es/texpict/ TeXPict] -- LaTeX picture Tcl/Tk editor, with some Emacs integration (via clipboard)
* [http://ee.usyd.edu.au/~thlai/emacs/index.html latex-doc.el] -- displays a brief document of LaTeX commands, environments and packages
* DviViewMode -- display a DVI file inside an Emacs buffer (uses dvipng); major mode with basic navigation
* AuxLabel -- refer to labels and references using the number that appears in the typeset document
* [[metapost-mode+]] -- add compilation and preview feature to old metapost-mode.el
* [https://github.com/tomathan/autopair-latex/blob/master/autopair-latex.el autopair-latex] -- auto pairs '$'s and '\[', '\]' in latex mode
* NobreakFade -- includes a <nowiki>TeX</nowiki> maths paragraph nobreak

Other
* GNU TeXmacs -- not quite !TeX or Emacs, but with a similar spirit
* LatexMk -- specialized make alike for !LaTeX; refresh preview on save
* LaTeXManual -- Free [[Texinfo]] manual for !LaTeX

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