LaTeX Backend

This is essential for producing PDFs without actually having to write a PDF file directly. The problem is it requires the user to have a TeX engine installed.

Classes to represent mathematics

A format-independent syntax should be introduced, along with translators that convert it to TeX, MathML, et cetera. The CommonDoc macro system could be used to define mathematics-specific macros.

Wiki

A wiki built on top of CommonDoc, with a web front-end and filesystem storage.