activepieces/activepieces: AI Agents + 400 MCP Servers in Open-Source Workflow Automation at 21.5K Stars

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Activepieces has evolved from a workflow automation tool into a full AI agent platform with the largest open-source MCP server connecting 300+ tools to AI chatbots. The 2026 version features an AI SDK for creating custom agents with your own rules and data, 492 pre-built integrations, and Model Context Protocol support for connecting agents to diverse data sources. Positioned as the open-source alternative to Zapier/Make with native AI agent capabilities.