FOSS NotebookLM with no data limits

NotebookLM is one of the best and most useful AI platforms out there, but once you start using it regularly you also feel its limitations leaving something to be desired more. There are limits on the amount of sources you can add in a notebook. There are limits on the number of notebooks you can have. You cannot have sources that exceed 500,000 words and are more than 200MB. You are vendor locked in to Google services (LLMs, usage models, etc.) with no option to configure them. Limited ex