I use Baobab on Linux. It appears to support MacOS as well.

https://apps.gnome.org/app/org.gnome.baobab/

I've used duc on Linux for a while. Can recommend.

https://duc.zevv.nl/

And the fact that you can run the indexing and visualization in separate passes is extremely useful, especially for E.g. large network file systems that are slow to index.

I like, I've been working on a faster parallel scanner written in go for the really large filesystems, in my env it's around 10x faster. In any case I find the scan -> database which the client can view quickly very useful.

Also note that there's text based, graphical, and web interfaces to view the database.

DaisyDisk on macOS https://daisydiskapp.com/

Strangely I haven't found yet a tool like spacemonger or spacesniffer for Linux. None have that square layout so ncdu it is.

Edit: I am trying something new here. Usually when I have beeninging complain or ask for help regarding a computer problem for a long time the solution appears in the minute in the comments or in a Google search. Fingers crossed.

QDirstat and K4Dirstat were the ones to use as of a few years ago; I don't know if there's a newer option since then.

They are still alive but they don't show the folder's names in the squares

Yes, GrandPerspective is a visual file space tool for Mac OS http://grandperspectiv.sourceforge.net/

OmniDiskSweeper on mac: https://www.omnigroup.com/more

GrandPerspective is free and has a lot of feature overlap http://grandperspectiv.sourceforge.net/

I use DaisyDisk for my Macs and WizTree for Windows

I often type

  du -ax / | xdu -n -c 9

qdirstat is the Linux equivalent. https://github.com/shundhammer/qdirstat

qdirstat - https://github.com/shundhammer/qdirstat