Vellum
Fast diagram editor combining whiteboard speed with formal documentation quality.
vellum.blueprintr.io
I love Excalidraw, I use it all the time for work to quickly draw up a proposal for a customer. But its annoying I have to re-draw the same thing, but better in Draw.io / Visio when it comes to writing the formal documentation later. Vellum is designed to give you the speed of a whiteboard, but the architecture-diagram-finish in quality. It uses YAML to store everything, and even has a 'graph' section for those of you who like the diagram-as-code elements of mermaid... but vellum allows full authoring of layout without the restrictions of Mermaid. I love it to bits. I hope
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