RAG・知識ベース
second-brain-os
A self-maintaining AI second brain for Obsidian and Claude Code.
★ 888 スターMIT
ガイドを見る →ontosphereは、ThHankeが公開しているオープンソースのRAG・知識ベースプロジェクトです（GitHub: ThHanke/ontosphere）。GitHubスターは247、フォークは30で、NOASSERTIONライセンスの下で公開されています。GitHubでの最終更新は2026年9月24日です。
Edit RDF knowledge graphs in your browser — no backend needed.
Decide what you want the project to do before installing anything.
Grab the source and skim the README for setup requirements.
Install dependencies and add any API keys or settings it needs.
Launch it and follow the example workflow from the docs.
Exposes its capabilities to AI agents over the Model Context Protocol.
Structures information as a queryable graph.
Bring notes from Obsidian, Notion, and more.
Own your second brain completely.
Combines keyword and semantic retrieval.
Connects notes into a queryable graph.
Download the source and move into the project folder.
git clone https://github.com/ThHanke/ontosphere.git
cd ontospherePull in the Node packages the project needs.
npm installStart the dev server and open the printed URL.
npm run devIt is an open-source project at ThHanke/ontosphere with 30 forks. Check the repo’s contributors and recent commits to judge how active maintenance is.
GitHub does not assert a license for this repo, so treat the code as all rights reserved until the author adds one.
Locally or on your own server, depending on how you deploy it.
Most support OpenAI, Anthropic, Ollama, and other providers via config.
Yes — MCP support lets agents search your knowledge base directly.
A self-maintaining AI second brain for Obsidian and Claude Code.
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LibreAIカタログに掲載されたRAG・知識ベースプロジェクトの中で最もスターの多いもの — ontosphereが合わなかった場合に検討したい、現実的な候補リストです。
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カタログの中でontosphereとスター数が近いRAG・知識ベースプロジェクト — 前後の棚もそのまま見て回れます。
Self-hosted rag & knowledge: 🧠 the brain for your ai — local-first memory engine for.
Semantic search engine designed for files and code.
Render and deploy a folder of markdown as a site in one move.
PDF reader with AI chat, flashcards, annotations, and text-to-speech.
AI-native data platform: 60+ connectors, ETL, scheduling, and RAG search.
Turn your GitHub stars into a searchable AI knowledge base.