the new version of imapping tools
a promising software based on Hierarchy, Brain Memory Palace, and Zettelkasten
https://youtu.be/So3GrubrPLc

Seems to be web-only.
I found it's predecessor iMapping interesting, albeit a bit ugly. The desktop app is still working.

They're working on desktop apps, they say.

Hi Folks,

1) Yes, an offline app of Infinity Maps is planned, we are just not there yet, because we feel we first have to focus more on the basics and user experience.
2) If you hate monthly subscriptions: There is a free plan, and one-time payment options.
3) The old iMapping Tool is not being actively maintained anymore. The new Infinity Maps will be superseeding it in any respect and in many it already has – here is what's new:

- Share interactive maps online
- Undo/Redo
- Copy/Paste – also between Maps
- Large Selection of Templates
- Help Area: Tutorials, Feedback Board and much more
- Optimized Performance
- Improved Usability
- Coming later in July 2021: Real-Time Collaboration and Presentation Mode

So, be sure to check out Infinity Maps and stay tuned – we are making a lot of progress…
https://infinitymaps/en/

Cheers – Heiko