dutreemap is a mini-app that shows your disk use in a "tree map" which is a
good visualization of what takes up space on your disk.
It's Python script that opens a Tk window and uses Tk widgets to display the map.
In general, there's a lot :)
I took my inspiration from Disk Inventory X (gitlab repo), which I've been a fan of (and used) for many years but it's no longer installable using Homebrew so I decided to just have Claude code up something for me.
For Python specifically there's python-du which looks pretty cool.