tex2rtf – TeX translator, output formats include RTF
Translates LaTeX text into RTF (Rich Text Format used by Microsoft Word), into MS-Windows Help RTF, into HTML or into wxHelp. Implemented using the free C++ class library wxWindows.
Free license not otherwise listed, or more than one free license applies
convert TeX-ish sources to some other markup (than HTML)
Maybe you are interested in the following packages as well.
- tex2mail: Converts TeX to mailable "ASCII art"
- texi2roff: Translate texinfo to troff
- pphlp: Generate VMS help files from LaTeX 2.09 source
- make4ht: A build system for tex4ht