OmniGraffle

OmniGraffle is a program that allows you to easily and quickly make a diagram of any concept, idea, or theory.

The drawing tools aren't anything more than shapes and lines that are dragged and dropped on the diagram surface. The user, with the help of the program, has to link the concepts to each other to facilitate the diagram compression.

OmniGraffle includes all kinds of shapes: squares, circles, pentagons, crosses, arrows, ovals, cylinders, etcetera. It can modify the properties of each one to achieve a more casual graphic. It can also create custom shapes thanks to bézier lines.

In diagrams in which the items are ordered in a hierarchical layout, OmniGraffle can provide the adequate appearance according to the hierarchical order.