Java based Software for visual block-based programming. In particular, MyOpenLab seems to be widely used to develop control programs that can run on Raspberry Pi and Arduino boards. MyOpenLab has an architecture that is not oriented around flow programming; it is what's called event driven. In event-driven programs, events determine the flow of the program. Typical events include mouse clicks, key presses, and messages from other programs. Perhaps for obvious reasons, graphical user interfaces typically are built around event-driven architectures.

NOTE: This is only to provide appimages, I am not the developer.