NotebookLM is great, but its ties to Google are less so. Open Notebook could be the alternative you've been looking for.
I've reviewed every PDF editor out there - then I had ChatGPT build me a better one ...
Semi-automate multi-protocol API calls, construct jq queries at the speed of light, or transform strings to and from any ...
NotebookLM set the standard, but this open-source alternative came closer than I expected.