[kalimatas]

I wonder what tool was used to create such beautiful diagrams.

[polyrand]

They seem to be done using Excalidraw [0]. I'm not 100% sure about the animated one, probably excalidraw-animate [1]

[0] https://excalidraw.com/ [1] https://github.com/dai-shi/excalidraw-animate

[jamesbriggs]

Excalidraw + Adobe Animate - I have never seen Excalidraw-animate before though so this could be new option!

[gk1]

Yep, you got it. We're big fans of Excalidraw!