Ruapho

Its open-source but not free (for commercial use). Node-Red is a completly free replacement.

Also using for many years with custom domain. They also support Caldav/Carddav which is great for using with software like Thunderbird.

Is a blackboard the same as a whiteboard, but with black background? 🤔

Long Time Developer always googling for specific tools when needed just learned about I.T. Tools. Thanks.