AutoGen
Microsoft's multi-agent framework, in maintenance mode since 2026; Microsoft points new projects to Agent Framework
AutoGen is an open-source framework from Microsoft for building multi-agent AI systems. Agents communicate through asynchronous, event-driven messages and can collaborate on complex tasks. It supports Python and .NET, with built-in patterns for group chat, round-robin and swarm orchestration. Features include tool use, human-in-the-loop control and multimodal input. AutoGen Studio provides a no-code UI for building multi-agent workflows. Part of Microsoft's broader Agent Framework alongside Semantic Kernel.
AutoGen is in maintenance mode: per its README it receives no new features and is community managed. Microsoft points new projects to Microsoft Agent Framework.
Pricing: Free
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