TODO gotta research those more:

roamresearch.com/ no public graphs
nesslabs.com/roam-research-alternatives a bunch of open source alternatives to it
- Trillium Notes. Notable project! Pun unintended!
- Stroll giffmex.org/stroll/stroll.html. How to publish? How to see tree?
- tiddlyroam joekroese.github.io/tiddlyroam/ graph rather than text searchable ToC. Public instance? Multiuser?
- Athens github.com/athensresearch/athens rudimentary WYSIWYG
- Logseq github.com/logseq/logseq no web interface/centralized server?
- Zim zim-wiki.org/ Local only. WYSIWYG.
itsfoss.com/obsidian-markdown-editor. Closed source. They have an OK static website publication mechanism: publish.obsidian.md/ram-rachum-research/Public/Agents+aren't+objective+entities%2C+they're+a+model but leaf node view only for now, no cross source page render.
www.notion.so/. Possible to publish pages: www.notion.so/help/public-pages-and-web-publishing
But non-paid plan currently disables "Search engine indexing" of that sharing, so it's useless. There's an "Allow duplicate as template" button though which is nice.
URLs are horrendous however, e.g.: lofty-flower-be4.notion.site/aa-2274c59a06124d5b974b781a67340670 Only the aa in that came from us. They don't even have the guts for a fixed subdomain.
Also it does not work without JavaScript, no SSR, everything is dynamic.
They don't show multiple input pages on the same render, e.g.: lofty-flower-be4.notion.site/aa-2274c59a06124d5b974b781a67340670 does not contain the child lofty-flower-be4.notion.site/bb-45df7212a2e14e04b3f9604035c7acf4 as already implemented on OurBigBook Web Dynamic Article Tree.
Cross page links to work fine. But you don't link to explicit IDs, only internal hidden IDs. This can be even slightly confusing to users as multiple identical options can show up when you start creating a link. They do try to disambiguate with the parent page however.
So this is a reasonable single-person publishing platform for your notes.
But no upvotes/topics. Favorites could be used as upvotes, but it does not seem like you can favorite other people's work. It's just not their focus, will never be.
They have an education push: www.notion.so/product/notion-for-education but it's likely hopeless.

Major downsides that most of those personal knowledge databases have:

very little/no focus on public publishing, which is the primary focus of OurBigBook.com
either limited or no multiuser features, e.g. edit protection and cross user topics
graph based instead of tree based. For books we need a single clear ordering of a tree. Graph should come as a secondary thing through tags.

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Knowledge graph editors

Ancestors