I would be interested in a critical review of the category and not only a bunch of links to landing pages designed by marketers. I'm having difficulty deciding whether this is a good paradigm or just a gimmick that looks good in screenshots. All these apps are basically reinventing
, but with an infinite scroll of plain paper instead of views and hyperlinks. Engelbart's paradigm is generally considered a good one, and replacing plain paper with views that can dynamically change and present the same information in more than one way is considered a significant step for humanity.
In my experience, having to lay things out on a canvas introduces the overhead of managing the layout, and doesn't use space efficiently enough to make things that are nearly as complex as can easily be made in non-spatial formats. A canvas of nodes is supposed to be a helpful way to look at complex things, but in reality, a canvas of nodes can't handle things that are complex.