polytexnic

One of the better ones in that space is https://www.softcover.io/ The build pipeline looks like: .md --> .tex --> .pdf/.html/.epub/.mobi/.html or you can start directly from the .tex .tex --> .pdf/.html/.epub/.mobi/.html If you're looking to write a book that has a lot of latex math equations in it, this is the "book builder" you need. The tech is open source, see https://github.com/softcover/softcover and https://github.com/softcover/polytexnic

One of the best looking HTML output from LaTeX can in fact be generated with https://www.softcover.io/ . Although it uses a limited subset of LaTex called PolyTeX (see https://github.com/softcover/polytexnic) I was able to convert my LaTeX documents quite easily to PolyTeX and generate good looking HTML output. Some example output can be seen in the manual http://manual.softcover.io/book/softcover_markdown#sec-embed... The softcover tools (https://github.com/softcover/softcover) are based on code developed for creating the HTML for http://tauday.com/tau-manifesto and http://www.feynmanlectures.caltech.edu/. Internally Softcover uses https://www-sop.inria.fr/marelle/tralics/ to convert from LaTeX to XML/HTML. P.S.: I'm not affiliated with softcover.io in any way.

on that note, check out the combo https://github.com/softcover/softcover/ + https://github.com/softcover/polytexnic/ which is a very good first start on that approach: markdown --> .tex ____ pdflatex --> .pdf \ \___ tralics --> ruby_scripts --> .epub