n8n

n8n is an extendable workflow automation tool. With a fair-code distribution model, n8n will always have visible source code, be available to self-host, and allow you to add your own custom functions, logic and apps. n8n's node-based approach makes it highly versatile, enabling you to connect anything to everything.

n8n has 200+ different nodes to automate workflows. The list can be found on: https://n8n.io/integrations.