Langflow

Langflow is an impressive open-source visual framework for building multi-step AI workflows and RAG applications using a drag-and-drop interface. Built on top of LangChain, it makes composing complex LLM pipelines remarkably accessible " you can chain together prompts, models, vector stores, agents, and tools without writing extensive code. The visual canvas is intuitive, and the ability to export flows as Python code or deploy via API adds serious production value. Being fully free and open-source is a major advantage, giving developers complete control over their infrastructure with no vendor lock-in. The API support enables seamless integration into existing applications. Limitations include a steeper learning curve for users unfamiliar with LangChain concepts, and the documentation, while improving, could be more comprehensive for advanced use cases. Community support is growing but not yet at the level of more established tools. Performance can also lag with very complex flows. Overall, Langflow stands out as one of the best free options for visually prototyping and deploying LLM-powered workflows, making it an excellent choice for developers and teams exploring agentic AI applications.