- pdfTeX - http://www.tug.org/applications/pdftex/
An extended version of TeX that can create PDF directly from TeX source files and enhance the result of TeX typesetting with the help of PDF. When PDF output is not selected, pdfTeX produces normal DVI output.
- TeXlib - http://sourceforge.net/projects/texlib/
A SourceForge project to develop a run-time TeX library, with support for enhancements such as e-TeX, pdf-e-TeX, Omega.
- TeX++ - http://www.damtp.cam.ac.uk/user/kp229/tex++/
A modern and free C++ implementation of TeX based on CommonTeX.
- TeX in C - http://www.math.uni.wroc.pl/~hebisch/tex/
Project converting the TeX source code from Web to C. Download of code and information on the conversion.
- FarsiTeX - http://www.farsitex.org/
Free Persian/English bidirectional typesetting system based on TeX. Currently available only for DOS.
- HyperTeX - http://arxiv.org/hypertex/
A standard of specials for turning (La)TeX documents in hyperdocuments supported by previewers for DVI and Postscript files.
- mimeTeX - http://www.forkosh.com/htdocs/mimetex.html
Program licensed under the GNU GPL which parses LaTeX math expressions emitting images which can be used directly in HTML documents. Introduction, manual and download.
- easyLaTeX - http://www.8ung.at/easylatex/
Software which calls all tools necessary to create PDF, DVI or HTML output out of simple text files (via LaTeX) using LaTeX like syntax. Download and documentation.
- Omega Project - http://omega.enstb.org/
Omega is an extension of TeX developed by John Plaice (Université Laval, Canada) and Yannis Haralambous (Atelier Fluxus Virus, France) aimed primarily at improving TeX's multilingual abilities.
- sTeXme - http://stexme.sourceforge.net/
Allows to manipulate TeX internals using the Scheme programming language. Sourceforge project page and guides.
- An eval for TeX - http://www.ccs.neu.edu/home/dorai/tex2page/eval4tex-doc.html
Using Scheme as an extension language for TeX. Download, documentation and information about PicScheme.
- QaTeX - http://qatex.sourceforge.net/
Allows Python modules to be used instead of (La)TeX style files to ease La(TeX) programming.
- NTS - http://nts.tug.org/
The NTS projected is aimed at developing successor for TeX; a New Typesetting System.
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