AutoGen

AutoGen is worth adding because it represents one of the clearest open-source agent-framework families for teams building collaborative, tool-using, multi-agent applications rather than single-turn assistants. The official docs split the system into AutoGen Core, AgentChat, Extensions, and tools like code executors and MCP workbenches. That makes AutoGen more than a lightweight wrapper. It is a fairly serious framework choice for developers who want agents to coordinate, route work, invoke tools, and run across more formal runtimes.

Its pricing posture is open-source at the framework layer. The official docs and GitHub repository present AutoGen as free software, and there is no public commercial pricing grid attached to the docs. That means the actual cost model sits beneath AutoGen: model providers, infrastructure, code-execution environments, and operations. Editorially, the right framing is that AutoGen is free to adopt as a framework, but real production cost comes from the systems it orchestrates.