OpenRain is described as 'OpenAI-compatible AI API gateway that lets developers access multiple major AI models through one API key and one unified endpoint' and is a large language model (llm) tool in the development category. There are more than 25 alternatives to OpenRain for a variety of platforms, including Web-based, SaaS, Windows, Self-Hosted and Linux apps. The best OpenRain alternative is GPT4ALL. It's not free, so if you're looking for a free alternative, you could try OpenRouter or liteLLM. Other great apps like OpenRain are Deep Infra, VoidLLM, AnyAPI and Character Gateway.