data structure replicated across a network such that any replica is updatable independently, concurrently and without coordination, and any inconcistencies are algorithmically resolved with replicas’ states guaranteed to eventually converge

https://github.com/toeverything/AFFiNE
There can be more than Notion and Miro. AFFiNE(pronounced [ə‘fain]) is a next-gen knowledge base that brings planning, sorting and creating all together. Privacy first, open-source, customizable and ready to use.