Hi Nico,
You might also want to try the recently released Obsidian Canvas. I've found both Excalidraw and Canvas to be phenomenal (and free) diagramming tools.
I have a list of other diagramming tools on my public Zotero library here.
3
CG
1y
Excalidraw + Obsidian's infinite canvas core plugin is truly a delight that I'm excited to see develop further. Lots of possibilities for better epistemics/PKM, and even more incredibly underrated for public sense-making/social epistemics in Obsidian.
There also exists an Excalidraw plug-in for Obsidian which I personally found very valuable.