Scientific Wordprocessing Software for MacOS X, MathML based equation editor, LaTeX export

Cassiopeia is the most popular Mac alternative to TeX4ht.
Cassiopeia is the most popular free alternative to TeX4ht.
- Cassiopeia is Freemium and Proprietary
TeX4ht is described as 'System for converting documents written in TeX/LaTeX/ConTeXt/etc. to HTML, various XML flavors, braille, etc., optionally using MathML' and is a Code Editor in the development category. There are five alternatives to TeX4ht for Windows, Linux and Mac. The best TeX4ht alternative is Cassiopeia, which is free. Other great apps like TeX4ht are TtM, latex2rtf, latex2html and LaTeXML.
Scientific Wordprocessing Software for MacOS X, MathML based equation editor, LaTeX export

Cassiopeia is the most popular Mac alternative to TeX4ht.
Cassiopeia is the most popular free alternative to TeX4ht.
TtM translates from Plain TeX and LaTeX into HTML including the equations in the form of embedded MathML.
TtM is the most popular Windows & Linux alternative to TeX4ht.
latex2rtf is a translator program to convert LaTeX formatted text files into “rich text format” (RTF) files. RTF is a published standard format by Microsoft. This standard can be ambiguous in places, but RTF is supported by many text editors.
latex2rtf is the most popular Open Source alternative to TeX4ht.
latex2html is a convertor written in Perl that converts LATEX documents to HTML. This way e.g. scientific papers - primarily typeset for printing - can be put on the Web for online viewing.
In brief, latexml is a program, written in Perl, that attempts to faithfully mimic TeX’s behaviour, but produces XML instead of dvi. The document model of the target XML makes explicit the model implied by LaTeX.