Status 2026-09-30
CopilotKit: MIT, ~37.6k stars; “The Frontend Stack for Agents & Generative UI” (React, Angular, mobile, Slack). Makers of the AG-UI protocol (ag-ui), which the repo says is adopted by Google, LangChain, AWS, Microsoft, Mastra, PydanticAI (vendor claim).
CopilotKit is behind ag-ui