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FastGPT is an open-source AI Agent platform that provides out-of-the-box data processing, RAG retrieval, and visual workflow orchestration. It supports multiple LLMs (OpenAI, Claude, DeepSeek, Qwen), features drag-and-drop workflow building, knowledge base management, and MCP integration. With 27k+ stars, it's a comprehensive solution for building complex question-answering systems without extensive setup.