I am looking for software for drawing shapes and diagrams as distinct from charting software. I'd like to be able to draw a spiral with arrow heads each end. Or circular diagrams made up of two, three or more segments with arrow heads and other ends. Or spirals, loops, or circles on circles.
As explanation is less than adequate, let me offer some examples of the types of diagrams I want to create:
Does anyone know a Windows software that I can use to draw such drawings?