n8n

n8n is a powerful source-available workflow automation platform that has become one of the most popular tools for building production AI agents. At its core is a visual, node-based editor where you wire together triggers, API calls, data transforms, and logic into reusable workflows — no heavy code required, though every node exposes a full JavaScript code panel when you need it. What sets n8n apart in the AI-agent space is its first-class LangChain integration. The Advanced AI nodes let you assemble agents that combine large language models with tools, memory, vector stores, and structured output, all on the same canvas as your regular automations. You can build a customer-support agent that reads from a knowledge base, calls external APIs, and posts back to Slack — as one orchestrated flow rather than scattered scripts. The platform ships with 400+ pre-built integrations covering the major SaaS tools (Google Workspace, Slack, Notion, HubSpot, GitHub, databases, and more), plus HTTP Request nodes for anything without a dedicated connector. Workflows run on a self-hostable instance for full data control, or on n8n Cloud for a managed experience. The Community Edition is free with no execution limits when self-hosted, which has driven a large, active community and tens of thousands of shared workflow templates. Teams value n8n for its fairness model (fair-code licensing), granular credential management, execution logs for debugging, and the ability to version workflows via Git. For builders who want the flexibility of a general-purpose automation engine with genuine AI-agent capabilities — rather than a locked-down no-code toy or a pure code framework — n8n occupies a unique and well-regarded middle ground.