emacs-auctex

AUCTeX is an extensible package that supports writing and formatting TeX files for most variants of Emacs.

AUCTeX supports many different TeX macro packages, including AMS-TeX, LaTeX, Texinfo and basic support for ConTeXt. Documentation can be found under /usr/share/doc, e.g. the reference card (tex-ref.pdf) and the FAQ. The AUCTeX manual is available in Emacs info (C-h i d m AUCTeX RET). On the AUCTeX home page, we provide manuals in various formats.

AUCTeX includes preview-latex support which makes LaTeX a tightly integrated component of your editing workflow by visualizing selected source chunks (such as single formulas or graphics) directly as images in the source buffer.