Node-RED is a graphical programming language for building connected objects (and many other things). Node-Red is an Open Source project (and free) supported by IBM. Programmed with Node-RED binder functions presented in the form of bricks. The data stream passes from one treatment to the other (from one function to the other). Some functions offer settings that simply set using a choice list or a field to fill (eg an API key to a weather service). There are hundreds of plugins in all areas, save data to a database (MySQL, MongoDB …) control the I/O of Arduino or Raspberry PI (with Johny Five plugin for example) add a graphical interface (UI) to draw graphics, display gauges, control a relay with a button …