I made an obsidian extension that does semantic and hybrid (RRF with FTS) search with local models. I have done some knowledge graph and ontology experimentation around this, but nothing that I’d like to include yet.

This is specifically a “remembrance agent”, so it surfaces related atoms to what you’re writing rather than doing anything generative.

Extension: https://github.com/mmargenot/tezcat

Also available in community plugins.