UnoRouter

Built by a developer who got tired of wiring a new SDK, key and billing account for every model vendor. UnoRouter is an open source LLM gateway that speaks the OpenAI API: keep your existing client code, swap the base URL, and pick any supported model by name. Requests are routed to a healthy upstream and fail over on their own when a provider breaks. It also works in Claude Code, Cline, SillyTavern and similar tools. The whole stack is public, the chat keeps history in the browser, and there is a free tier before pay as you go.