CrewAI

CrewAI is an open-source Python framework for orchestrating multi-agent AI systems, paired with a hosted enterprise platform for running those agents in production. It is aimed at developers and AI builders who want to assemble teams of role-playing agents that collaborate on a task, and at larger organizations that need control and observability when those workflows go live. The framework is MIT-licensed with a very large community behind it.

The mental model is clean: you define agents with roles, give them tasks, group them into crews, and connect everything with flows. It runs lean and fast without a heavy framework dependency underneath, and it works with most major LLMs including OpenAI, Anthropic, and Gemini, plus local models through Ollama. That flexibility means you can prototype freely and avoid getting boxed into one vendor. CrewAI reports heavy adoption across large enterprises and hundreds of millions of agentic workflows running monthly.

It fits well for research crews that gather and summarize information, content and marketing pipelines with handoffs between agents, and sales workflows like lead enrichment. Start free with the open framework, then move to the managed platform when you need to deploy and monitor at scale.