I see many of my friends building some kind of RAG system with chat interface. I have been building some stuff on top of the OpenAi interface (to use their sto

I see many of my friends building some kind of RAG system with chat interface. I have been building some stuff on top of the OpenAi interface (to use their store) but find myself wanting to implement some simple UI elements (like a date selected or a simple dashboard). So I feel like these types of apps have a few re occurring elements: 1. A chat interface „frontend“ (with threads, interfaces to popular APIs or local models) nice Ui ideally extensibility to some custom UI elements authentication etc. 2. API calls. (E.g. like OpenAI actions) Simplest case just reading and writing to a db (simple crud). 3. Local data + RAG. With a custom retrieval/search logic could be embeddings or simpler search methods. Do you know open source software for all three elements? Of course you can piece it together and maybe this is the best approach. But maybe you could build something integrated.