Pliim - One click and be ready to go up on stage and present!
Virtual Magnifying Glass - Virtual Magnifying Glass, a free, open source, screen magnification program for Windows, Linux, FreeBSD and Mac OS X. Free full version download and instructions for use.
Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
Magnifixer - Magnifixer is a screen magnifier utility.
Hocus Focus - A Mac menu bar utility that hides your inactive windows
ZoomIt - Presentation utility for zooming and drawing on the screen.