CrewAI

CrewAI lets developers define teams of AI agents with distinct roles, tools, and goals, then coordinate them to tackle tasks that require planning, research, writing, and execution in sequence. It supports both sequential and hierarchical agent workflows and integrates with tools like web search, code interpreters, and custom APIs. CrewAI Enterprise adds a visual flow builder, deployment infrastructure, and human-in-the-loop controls. The open-source core is free and widely adopted for production agent applications.