@FakeMaidenMaker: Anyone managing notes or knowledge bases should bookmark these 6 essential open-source 'Second Brain' tools. All are local-first, with data under your control, no need to hand over your notes to anyone: 1. Logseq (43.3k stars) - Outline + block references, notes are local markdown files, zero subscription, …

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Summary

Recommends 6 open-source, local-first 'Second Brain' note and knowledge management tools, including Logseq, SiYuan Note, AppFlowy, Khoj, QMD, and LightRAG, emphasizing data autonomy and privacy.

Anyone doing note management or knowledge base management, these 6 open-source 'Second Brain' essential tools are recommended for bookmarking All local-first, data under your control, no need to hand over your notes to anyone: 1. Logseq (43.3k stars) Outline + block references, notes are local markdown files, zero subscription, zero lock-in https://github.com/logseq/logseq 2. SiYuan Note (44.3k stars) Everything is a block, fully offline usable, fully open-source from China, maximum privacy https://github.com/siyuan-note/siyuan… 3. AppFlowy (72.1k stars) Open-source Notion alternative, documents, wiki, project management integrated, self-hostable https://github.com/AppFlowy-IO/AppFlowy… 4. Khoj (35.0k stars) Self-hosted AI second brain, connects to GPT/Claude/local models, directly chat with all your notes https://github.com/khoj-ai/khoj 5. QMD (26.2k stars) Local markdown search engine written by Shopify CEO himself, serves as cross-session memory for AI https://github.com/tobi/qmd 6. LightRAG (36.3k stars) Open-source from HKU, automatically builds knowledge graphs from materials, can answer complex cross-document questions https://github.com/HKUDS/LightRAG The first three are for storing knowledge, the last three let AI access the knowledge base, building a fully local, privacy-secured Second Brain for you.
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Logseq

A privacy-first, open-source platform for knowledge management and collaboration

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