Omnidazzle (Mac only) adds a layer over your desktop and gives you all sorts of tools. You can focus on certain elements using a searchlight or making an instant zoom selection. You can scribble over your desktop, over anything that’s there: PowerPoint or Keynote presentations, word documents, images, movies, desktop icons, browsers – anything. You can use different colors and erase everything with a simple shortcut. I like to sometimes takes screen shots with the overlay before I wipe it all away. There are some funky effects, such as fairy dust (dazzling!), footprints, or comic effects: Pow! Zot! Boom!
Granted, not all of this is useful, but some effects really enhance your presentation. Others add least add some fun to it. Download away and try it out. The web site tells you: “You’re free to use OmniDazzle as long as you like but while unlicensed it will expire after 1 hour of use and you’ll need to relaunch.” No risk in trying it out, and the $14.95 for a license are quite reasonable.
Nothing like showing my viewers what part of the screen I’m referring to, and nothing like a bit of fairy dust to wake up my students in the morning.
Software link: Omnidazzle