LaTeXML - In brief, latexml is a program, written in Perl, that attempts to faithfully mimic TeX’s behaviour...
TexitEasy - TexitEasy is a free, cross-platform and open-source latex editor.
latex2html - latex2html is a convertor written in Perl that converts LATEX documents to HTML. This way e.g.
latex4technics - Online LaTeX editor with autocompletion, highlighting and 400 math symbols.
asciiTeX - asciiTeX is an ASCII equation renderer released under the terms of the GNU General Public License.
Lagrida Latexeditor - Lagrida Latexeditor is an all-in-one website that lets you edit, write or check the authentication of your mathematical equations or symbols in a decent manner without any hassle.