I think the Roam Research style backlinked knowledge management apps are directly enabled by datascript.

Two "copy cats" (not meant to be derogatory) of Roam that are open source are: https://github.com/logseq/logseq https://github.com/athensresearch/athens

The underlying in memory datalog style database that can run in the browser that enables these apps https://github.com/tonsky/datascript