n8n

n8n is a workflow automation tool. It can call APIs, listen for webhooks, run scheduled jobs, transform data, and connect services without writing a full application.

You can use it as a hosted service or run it yourself. A self-hosted setup often uses Docker Compose with a database such as PostgreSQL, then puts access in front of it with something like Cloudflare Tunnel.

The warning is obvious but worth saying: automation tools end up holding credentials. Treat an n8n instance like a sensitive system, not a toy dashboard.