10 open-source GitHub repos to build an AI-powered second brain
Shruti_0810 · x · 2026-11-01
A curated list of 10 open-source projects for building a personal AI "second brain" that makes thousands of PDFs, papers and web pages searchable in seconds:
- Open Notebook: self-hosted AI research & note-taking workspace
- Kotaemon: RAG UI to ask questions over your documents
- Oxylabs Web API MCP: live web search inside research workflows
- MinerU: structured extraction from complex documents
- Marker: convert PDFs into clean Markdown/structured data
- Paperless-ngx: searchable digital archive
The recipe: document parsing (MinerU/Marker) + RAG frameworks (Kotaemon) + archiving (Paperless-ngx) + web MCP. The attached image shows ragas (16k stars), an LLM app evaluation project.
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