Logseq

logseq.com

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An open-source, local-first knowledge management tool that uses an outliner format with bidirectional linking to connect notes, journals, and tasks.

Why it is useful

Stores all data as plain-text Markdown files on your own machine, meaning you own everything and there is no server to shut down or subscription to lose. The graph view and bidirectional links make it genuinely useful for building a personal knowledge base rather than just a note archive. A strong open-source alternative to Roam Research and Obsidian with a built-in task management system.