Excalidraw
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Feels a bit phony to nominate my own plugin… but Excalidraw has truly transformed my PKM workflow. It is all that I wanted a good sketching tool to be. By being able to link drawings to documents and to one another, Excalidraw has become an integral part of my knowledge graph. It is practically integrated into all my workflows: book summaries, maps of content, meeting notes, creative thinking, blogging, and much more.