See a bigger, interactive version (requires Javascript). GraphViz source code included below.
// Render with twopi; neato output looks better, but is too sprawling.
// Also twopi better preserves the original intent.
digraph {
layout=twopi
overlap=scale
label="Outliners, note-taking apps and everything\nCC-BY-SA"
Outliners [shape=folder;style="bold,filled";fillcolor=yellow]
Outliners -> { OrgMode Zim }
OrgMode [fontcolor=blue,label="Org Mode",href="https://orgmode.org/"]
Outliners -> Old -> hnb
Old [shape=folder,style=bold]
Outliners -> Unusual -> { TreeSheets TreeLine }
TreeSheets [fontcolor=blue,href="https://strlen.com/treesheets/"]
TreeLine [fontcolor=blue,href="https://treeline.bellz.org/"]
Unusual [shape=folder,style=bold]
Outliners -> Mobile -> Orgzly
Orgzly [ fontcolor=blue, href="https://orgzly.com/" ]
Mobile [shape=folder,style=bold]
Outliners -> Formats -> { OrgFiles OPML }
Formats [shape=folder,style=bold]
OPML [ fontcolor=blue, href="http://opml.org/" ]
// Orgzly -> OrgFiles [weight=0]
OrgFiles [label="Org files"]
NoteTaking [shape=folder;style="bold,filled";
fillcolor=yellow;label="Note\nTaking\nApps"]
NoteTaking -> Zim
NoteTaking -> Web -> { TiddlyWiki "Feather Wiki" Domino }
Web [shape=folder,style=bold]
TiddlyWiki [ fontcolor=blue, href="https://tiddlywiki.com/" ]
"Feather Wiki" [ fontcolor=blue, href="https://feather.wiki/" ]
Domino [ fontcolor=blue, href="https://kool.tools/domino/#0,0" ]
Zim [ fontcolor=blue, href="https://zim-wiki.org/" ]
NoteTaking -> MobNote -> { Markor Tiddloid }
Markor [fontcolor=blue,href="https://gsantner.net/project/markor.html"]
Tiddloid [fontcolor=blue,href="https://github.com/donmor/Tiddloid"]
MobNote [shape=folder,style=bold,label=Mobile]
NoteTaking -> OldNote -> { Tomboy Gnote }
OldNote [label=Old,shape=folder,style=bold]
}
Copyleft: This is a free work, you can copy, distribute, and modify it under the terms of the Free Art License.