GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content: text, mathematics, graphics, interactive content. TeXmacs can also be used as an interface to many external systems for computer algebra, numerical analysis, and statistics. New presentation styles can be written by the user and new features can be added to the editor using Scheme.
glatex is a small program designed to help you to edit your LaTeX document files (sources, styles, bibliography, figures, postscript images, etc.). It maintains a list of all your editable files in order to allow you to edit them quickly. But you can also launch the compilator, viewer, and print commands, and it allows you to have document templates for creating new projects. It is not intended to manage the files themselves. For example, if you move a file from one directory to another, you'll have to remove it from the list and re-add it from its new location.
dlh is a fast LaTeX-to-HTML translator written in C that can handle most of LaTeX. It features not invoking LaTeX for any purpose; with the exception of figure support it's completely independent of any other program. In particular, it generates all cross-references and table of contents in a single run Tables are supported and translated into HTML3 tables, and PostScript figures (\psfig command) are supported (requires GhostScript and pnmtogif to translate PS into GIF files).
Kile is a user-friendly TeX/LaTeX editor for the KDE desktop environment. It lets you compile, convert, and view your document with one click and features auto-completion of (La)TeX commands, templates and wizards for starting a new document, easy insertion of many standard tags and symbols and the option to add user defined tags, inverse and forward search, collection of documents that belong together into a project, easy insertion of citations and references, a flexible build system, QuickPreview of selected parts of a document, easy access to various help sources, and advanced editing commands.
VTeX/Lnx is a TeX program that generates PDF or PostScript output immediately from the TeX source file. In contrast to pdfTeX, VTeX supports inclusion of PostScript images (EPS), as well as inline PostScript programming, even when generating PDF output. VTeX includes a complete LaTeX system, Bibtex, and Makeindex. Packages such as PStricks, PSfrag, and draftcopy can be used with VTeX.
The Freehand Formula Entry System is a research prototype for recognizing online handwritten mathematical notation, developed jointly by researchers in New Zealand, the United States and Canada. A user draws expressions with a mouse or data tablet, and LaTeX, a bitmap, and an operator tree are produced as output. Symbol recognition and expression interpretation are performed as the user draws.