AMS-LaTeX - Document classes for typesetting an AMS article or book and enhancements for math formulas. Considered a required package.
AMSFonts - Special fonts for math typesetting going along with AMS-LaTeX. Metafont sources, supporting macro files, font metrics, and PK files, and reference to Type 1 (PostScript) versions.
BGSup - Adds Bulgarian language support to LaTeX via the Babel mechanism, using CP1251 encoding.
Charles Clayton's LaTeX Page - Help and advice on using LaTeX with external graphics, producing HTML documents with LaTeX, and on producing documents in PDF format.
Configuration options for LaTeX2e - This document describes the possibilities for configuration in this release of LaTeX; it also explains how to configure the font definition files to take advantage of the available fonts.
Converters between LaTeX and PC Textprocessors - FAQ on converters for LaTeX <-> PC Textprocessors.
Errata for the LaTeX Companion - The latest erratas for the LaTeX Companion by Goosens, Mittelbach and Samarin.
Excel2LaTeX - This Excel-To-LaTeX converter exports the current selection as a LaTeX file, which can be included via the \input command in an existing LaTeX document.
GASTeX - A set of LaTeX macros which allow to draw very easily graphs, automata, nets, and diagrams under the picture environment of LaTeX.
General documentation about (La)TeX
Getting Started with LaTeX - A short primer on LaTeX.
Gregor's LaTeX Guide - LaTeX resources by Gregor von Laszewski.
Hyperlatex Manual - Hyperlatex is a package that allows you to prepare documents in HTML, and, at the same time, to produce a neatly printed document from your input. Unlike some other systems that you may have seen, Hyperlatex is not a general LaTeX-to-HTML converter.
Hypertext Help with LaTeX - These hypertext help files are meant to provide reference information for those with some familiarity with LaTeX. They are not an introduction or tutorial.
jPicEdt - A picture editor for LaTeX, entirely written in Java. (Open Source, GPL).
LaTeX Catalogue Online - Lists 1200 TeX, LaTeX, and related packages and tools. Most are available online from CTAN, the Comprehensive TeX Archive Network. Index can be searched or browsed.
LaTeX Info and Links - Links to a number of documents and LaTeX sites already available.
LaTeX Introduction - This site includes LaTeX introduction files, LaTeX sample file, BibTeX sample file, installing xfig on Windows, bibliography database server, and other LaTeX related links.
LaTeX2e font selection - This document describes the new font selection features of the LaTeX Document Preparation System. It is intended for package writers who want to write font-loading packages similar to times or latexsym.
LaTeX2e for authors - This document describes how to take advantage of the new features of LaTeX, and how to process your old LaTeX documents with LaTeX2e.
LaTeX2e for class and package writers - This document is an introduction to writing classes and packages for LaTeX2e, with special attention given to upgrading existing LaTeX2.09 packages to LaTeX2e.
LaTeX2e: Should You Upgrade to It? - Why to upgrade from LaTeX2.09 to LaTeX2e.
LaTeXe Help 1.6 - Created from LaTeX2e.TeXi.
Leslie Lamport - Home Page - The "La" in LaTeX.
LNCS/LNAI - Document class and author information for Lecture Notes in Computer Science (LNCS) of Springer-Verlag.
Modifying LaTeX - This article describes the principles underlying our policy on distribution and modification of the files comprising the LaTeX system.
PSTricks - Access PostScript capabilities inside (La)TeX, by Timothy van Zandt. Site contains documentations, bugs list, examples of application, and more packages by the author.
Tetex-LaTeX Font Installation - Straightforward explanation for True Type and PostScript type 1 fonts.
TeXPower - PowerPoint-like presentations with LaTeX.
Text Processing using LaTeX - The LaTeX page at Cambridge. Some introduction and good documentation.
The amsrefs Package (for LaTeX) - The amsrefs package is an extension package for LaTeX that permits bibliography style to be controlled completely through LaTeX instead of being determined chiefly by a BibTeX style file.
The LaTeX Home Page - The latest version of LaTeX and information on the LaTeX3 project, with documentation and experimental code.
The LaTeX3 Project - This article describes the motivation, achievements and future of the LaTeX3 Project, which was established to produce a new version of LaTeX, the widely-used and highly-acclaimed document preparation system. It also describes how you can help us to achieve our aims.
The Not-So-Short Guide to LaTeX - Or LaTeX2e in 69 minutes by Tobias Oetiker.
Web and Exerquiz (PDF) - Create an attractive page layout suitable for the WWW and easily create interactive exercises and quizzes in the PDF format. Web page contains documentation and samples.