TtM - TtM translates from Plain TeX and LaTeX into HTML including the equations in the form of embedded...
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
latex2rtf - latex2rtf is a translator program to convert LaTeX formatted text files into “rich text format”...
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
LaTeXML - In brief, latexml is a program, written in Perl, that attempts to faithfully mimic TeX’s behaviour...
Texmaker - Texmaker, free cross-platform latex editor