Description of Ultimate Pen (Mac OS X; download) program at Mac Shareware: Requires Mac OS X v10.2 or later.Draw on any application using a variety of tools in your choice of colors. You can set up a system wide hot key to quickly show or hide your drawing at any time.

Requires Mac OS X v10.2 or later.Draw on any application using a variety of tools in your choice of colors. You can set up a system wide hot key to quickly show or hide your drawing at any time.The tools are pressure sensitive when using a pen tablet. You can have the tablet adjust the width and/or opacity of drawing. All tools have a keyboard shortcut, so it's incredibly easy to switch tools on the fly.Automatically saves your drawing and selected toolset between sessions. Hide the menu bar to draw seamlessly on other full screen applications.Activate Click-Through mode to allow your drawing to float on top of the screen while you control other applications. Desktop Drawing mode allows the drawing to be behind everything else so it feels like you are drawing on the desktop itself.Academic and volume licensing available upon request

Ultimate Pen (Mac OS X; download) is a completely free software. You can free download and use it as long as you like.