Hi Mitchell, thanks for this list. I do prefer prototyping software. Can I suggest it below?

The one I like is Mockplus (http://goo.gl/4cYAtG). It has two prototyping styles as “wireframe” and “sketch”, the latter one just like the hand drawing by pen. With Mockplus, you can easily and rapidly create prototypes. Just drag and drop the components, and link them between pages or components.

Once finished the design, just scan the QR code to view it on the Mockplus app to test with real device. That’s really good!