cure53 / DOMPurify

DOMPurify - a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks. Demo:

AngleSharp / AngleSharp

:angel: The ultimate angle brackets parser library parsing HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specifications.

mathjax / MathJax-src

MathJax source code for version 3 and beyond

brucemiller / LaTeXML

LaTeXML: a TeX and LaTeX to XML/HTML/ePub/MathML translator.