A new print-css.rocks release is available with support for some new tools: Typeset.sh
Plone ships with Kupu since ages. However I think Kupu really sucks and there are better alternatives. We tried to make our last customer happy with Kupu they really did not like it. We've been looking at alternatives and come over FCKEditor. It has also a seamless Plone integration that works without problems. Just download the archive, install it and replace Kupu in your personal member preferences with FCKEditor. It's really much more powerful than Kupu. Plone should really ship with FCKeditor in future versions. Kupu is just annoying.