CrewAI
Role-based multi-agent framework with declarative crew definitions.
CrewAI builds around the metaphor of a crew of specialists collaborating on a task. The declarative API is friendly to non-experts and the documentation is unusually good.
Strengths. Approachable, batteries-included, strong tutorial coverage.
Weaknesses. Opinionated abstractions can be hard to escape.
Use it when you want a fast on-ramp to multi-agent patterns without writing graph code.