n8n

n8n (pronounced "n-eight-n") is a powerful, source-available workflow automation platform that lets technical teams build complex AI workflows with 500+ integrations. Unlike Zapier or Make, n8n can be self-hosted, giving you complete control over your data and infrastructure—including running local AI models. The platform combines visual workflow building with the ability to write custom code when needed. Build multi-step AI agents that call custom tools, chat with your own data, and automate complex business processes. Features include AI nodes for OpenAI/Claude/local models, vector database integrations, and credential management. Used by companies like NASA, Adobe, and Twilio. Free for self-hosting; cloud plans start at $20/mo.