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A list of different editors

https://wallapatta.github.io/

https://obsidian.md/

https://github.com/codemirror/CodeMirror

Realtime / p2p / CRDT

Atom has a very nice setup for editing peer-to-peer https://teletype.atom.io/

https://www.npmjs.com/package/crdt-md-editor

https://conclave-team.github.io/conclave-site/

https://github.com/3mcd/p2p-edit

https://discuss.prosemirror.net/t/offline-peer-to-peer-collaborative-editing-using-yjs/2488/9

https://yjs.dev/

https://peerpad.net/