You must log in or register to comment.
https://github.com/excalidraw/excalidraw
Excalidraw is great, but can be a pain to set up locally if you require the collaboration features.
There’s also an Obsidian plugin that gives you a local setup without the extra config for sharing
Inkscape works well for this.
I’ve used Dia for years, great simple tool for diagramming & if I need something more I’ll switch to graphviz dot files