The closest open-source alternatives to Notion and Miro (opens in new tab)

I am genuinely impressed with what I see: Customisable tables, document editing as in notion combined with the drawing features (which I presume are inspired by Miro). The endless canvas / presentation feature reminds me of Prezi (but without transitions). All of this free and open source, really nice!

I did encounter plenty of glitches related to zoom and toolbars disappearing on firefox. As I didn't sign up all the AI integrations are not working; as someone else suggested it would be cool if I can just enter an API key somewhere. I recently tried out excalidraw. Really like the looks and how the arrow snapping works there. Excalidraw is MIT licensed so perhaps you can integrate it?

I think Notion made this "slash command" block editor popular, but the underlying editor most of these editors use is actually TipTap: https://tiptap.dev/docs/examples/experiments/slash-commands

Or perhaps Notion invented the slash commands? Not sure now...

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Also: perhaps localstorage doesn't work for you (platform, permissions, browser, etc) so the account seems required.