Just showcasing something I've been hacking on with a friend we decided to open source. Proxy GPT is a GPT backend powered by OpenAI. It includes a team based chat api, user signup, login, context caching and much more. It's an abstraction layer on top of OpenAI's chat API that makes it slightly easier to programmatically build chat apps that might require custom user signup/auth, separate teams and chats, etc.
Let me know what you think.