As always, check out TeXmacs, which does this sort of thing best: http://www.texmacs.org/tmweb/home/screenshots.en.html http://www.texmacs.org/tmweb/home/scree

As always, check out TeXmacs, which does this sort of thing best: http://www.texmacs.org/tmweb/home/screenshots.en.html http://www.texmacs.org/tmweb/home/screenshots.en.html https://www.mindomo.com/mindmap/tool-tips-b207992c90c046bdbe4053cbdf88b5d5 https://www.mindomo.com/mindmap/tool-tips-b207992c90c046bdbe... [mind map] https://www.gnu.org/ghm/2013/paris/slides/texmacs--poulain--ghm-2013.pdf https://www.gnu.org/ghm/2013/paris/slides/texmacs--poulain--... [pdf]