math-core allows you to convert LaTeX math to MathML Core, the MathML specification that is being implemented by web browsers. For example, this LaTeX code: The goal of this project is to translate ...

Allows you to use MathJax's fonts in LaTeX. Why? If you're creating diagrams in MetaPost (or any other drawing program that can use LaTeX labels) to display on a website alongside MathJax then it's ...