Orion Markup 3.03 | MacOSX | 36 MB
The app lets you open an image (including, of course, screenshots taken from your own Mac), and add all sorts of annotations in the form of text, graphical elements, highlights, callouts, and more. And, when you’re ready, Orion Markup’s powerful sharing features mean that sending your work to friends and colleagues is just a click (or two) away.