Outline of outliners

An outliner (or outline processor) is a specialized type of text editor (word processor) used to create and edit outlines, which are text files which have a tree structure, for organization. Textual information is contained in discrete sections called "nodes", which are arranged according to their topic–subtopic (parent–child) relationships, like the members of a family tree. When loaded into an outliner, an outline may be collapsed or expanded to display as few or as many levels as desired.
— From Wikipedia, the free encyclopedia

Outliners overlap with note-taking apps, often by a lot. Also many of them support time tracking, task lists and so on.

This is an interactive mind map I made a while ago using Domino and sadly underused since. It's a self-contained document that can save modified copies of itself; just beware that it messes with the browser's Back button (sorry; not my code). Suggestions are welcome; there's much more to be said about the topic. Thank you!