HiddenMe - Hide desktop icons with a single click.
Pliim - One click and be ready to go up on stage and present!
Declutter - Cleans and organises your files in Mac desktop automatically
PresenterMate - Unclutter your desktop, clear your mind.
Carpet - The easiest way to keep your desktop "clean" ;)
Hocus Focus - A Mac menu bar utility that hides your inactive windows