Permit employees to consult with the past twenty years of documentation

Seeking
Open-source
Embedding and LLM run on local machine
Userfriendly UI, at least for end-users
RAG (docx, pdf, txt, etc.)
Swappable LLM w/ GPU support
Containerized would be ideal

I have looked at jan.ai, dify, bionic-gpt, danswer, gpt4all. Open to other ideas or products, as they re all rapidly evolving.