The strongest open-source alternatives to AutoGen for building AI agents — agent frameworks ranked by GitHub traction, each with a head-to-head.
AutoGen (★ 59k) is Microsoft's framework for multi-agent conversation, with a programming model for agents that talk to each other and tools. If it is not the right fit, these 5 agent frameworks cover the same ground — CrewAI is the most-starred option below. Or browse the best agent frameworks and AutoGen's own page.
Role-playing autonomous agents that collaborate as a 'crew' with defined roles, goals, and task delegation. Best for role-based multi-agent teams.
Data framework for connecting LLMs to private data — indexing, retrieval, and agentic RAG over your documents. Best for RAG.
Graph-based orchestration for stateful, multi-actor agent workflows with explicit control flow and checkpointing. Best for stateful multi-agent workflows.
Programming — not prompting — language models: compile declarative pipelines into optimized prompts/weights. Best for prompt optimization.
Type-safe agent framework from the Pydantic team — structured outputs, dependency injection, and model-agnostic agents. Best for type-safe agents.
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