I've seen a trend in scientific videos/tutorials where the concept at hand is being sketched out, either by hand for real, or emulated by making it appear as if the images are handdrawn (while still beeing computer images)
e.g. like this one: https://www.youtube.com/watch?v=_I94-tJlovg
Is there a name for this specific graphical style of videos? And, are there public software to do it?