Open-source alternatives to Roam Research

The open-source or self-hostable project you can use instead of Roam Research, with license, free-edition limits and setup checked against official sources.

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LogseqAlternative to Notion, Roam Research
A privacy-first, open-source knowledge base and outliner that stores notes locally and links them with [[backlinks]].
AGPL-3.0Self-hosted
45k
GitHub stars
Some features paywalled

Logseq — Logseq is an outliner with page links and backlinks, the same style of networked note-taking that Roam Research offers.