free-one-api is an open-source tool that enables access to various reverse-engineered Large Language Model libraries through the standard OpenAI API format. It supports a wide range of AI models including ChatGPT, gpt4free, Bard, Claude, HuggingChat, and Tongyi Qianwen, allowing users to interact with these services without official API keys. The software features automatic load balancing across multiple channels, a built-in Web UI for easy management, and support for streaming responses. It includes robust stability mechanisms such as heartbeat detection to automatically disable unavailable channels and maintain service continuity. The system logs operational data for monitoring and debugging purposes. Designed for developers and users seeking cost-free access to LLM capabilities, it simplifies integration by translating diverse reverse-engine SDKs into a unified interface compatible with existing OpenAI client applications. The project is actively seeking community contributions to expand adapter support an