I am looking for a drawing program with one specific feature: the ability to have auto-connecting block arrows (in particular, ones that automatically make right-angle bends as necessaryand being able to specify the roundedness of the bends would be great.) In other words, when I have two boxes in a flowchart, I want to make a block arrow and connect the ends of that block arrow to the two shapes, so that as I move the shapes around the block arrow stays connected to them. Just about every drawing / presentation / mind mapping program lets you make regular line arrows that stay connected to shapes as you move them around. And most of those programs also let you make block arrows. But I have not found one that lets you make an auto-connecting block arrow. Any ideas?