There are many different versions of Flowgramming, more and more software are starting to use it.
Unity now has an extension and Unreal, GameMaker, and a few others have it built in too.
Unlike those, Flowlab has by far the easiest to learn and simplest design of Flowgramming that I’ve seen. But also advance enough to let learning users to do more with it, like advance mathmatics.
PS. Flowgramming = Drag & Drop