Texify
- An online LaTeX equation writer. Generates links for email messages, web pages and forums.
- http://www.texify.com/

The Ipe Extensible Drawing Editor
- Graphics program for creating PDF or EPS figures that can contain LaTeX-processed formulae and other text. Includes program download, FAQ, online bug tracking, and manual.
- http://tclab.kaist.ac.kr/ipe/

TpX
- TeX drawing tool for Windows which supports several output formats. SourceForge project page with download and online documentation.
- http://tpx.sourceforge.net/

The Ultimate Latex Makefile
- To be used with the 'make' utility to automatically compile multiple-source LaTeX files to specified output formats. Changelog and download.
- http://www.acoustics.hut.fi/u/mairas/UltimateLatexMakefile/

latex2xml
- LaTeX to XML converter. Includes download and instructions. Full documentation in German only.
- http://www.latex2xml.org/

LaTeXML
- A LaTeX to XML converter. Download, examples, and documentation.
- http://dlmf.nist.gov/LaTeXML/

Tralics
- Open source LaTeX to XML translator. Includes downloads and documentation.
- http://www-sop.inria.fr/apics/tralics/

Calc2LaTeX
- An OpenOffice.org Calc (Spreadsheet) macro for converting tables to LaTeX syntax.
- http://calc2latex.sourceforge.net/

The LaTeXDraw Project
- Open source PSTricks code generator and editor written in Java. Program download, online manual, and details of how to get involved with the project.
- http://latexdraw.sourceforge.net/

Rubber
- A Python script to automatically run latex and related commands on a LaTeX source file.
- http://www.pps.jussieu.fr/~beffara/soft/rubber/

Xindy
- Index processor to create indexes for arbitrary document-preparation systems. Includes overview, documentation, FAQ, and download. [GPL license]
- http://www.xindy.org/

ChkTeX
- A semantic and syntactic checker for LaTeX source files, designed to complement LaTeX's own built-in checks.
- http://baruch.ev-en.org/proj/chktex/

Hyperlatex
- Package to allow the preparation of documents in HTML, with the simultaneous production a neat printable LaTeXed version. Unlike some other systems, this is not a general LaTeX-to-HTML converter.
- http://hyperlatex.sourceforge.net/

Latexmk
- Perl script to automatically run latex and related commands. It may also start a previewer and then run latex whenever the source files are updated, so that the previewer gives an up-to-date view of the document.
- http://www.phys.psu.edu/~collins/software/latexmk/

Lix (LaTeX index)
- A filter, written in Perl, that converts entries in .idx files such that makeindex sorts them correctly for non-english languages. Description and download.
- http://joyds1.joensuu.fi/lix/index_en.html

Excel2LaTeX
- A free tool from Jam Software, that produces LaTeX source code from a cell-selection in Microsoft Excel.
- http://www.jam-software.com/freeware/index.shtml#excel2latex

jPicEdt
- A Java picture editor with a graphical interface. Outputs LaTeX, eepic, and pstricks code for use in documents.
- http://jpicedt.sourceforge.net/

PPower4
- Post-processing of PDF files produced by (La)TeX, to add dynamic effects for presentations. Download the Java program, style files, and documentation.
- http://www-sp.iti.informatik.tu-darmstadt.de/software/ppower4/

Kile
- LaTeX front end for KDE, that integrates many tools needed to develop documents with LaTeX, in just one application.
- http://kile.sourceforge.net/

GCLC
- A tool for describing geometric constructions and making digital illustrations in LaTeX and bitmap format. Available for Windows and Linux.
- http://www.matf.bg.ac.yu/~janicic/gclc/