Epic Pen - A windows tool for drawing over your desktop and applications
Magnifixer - Magnifixer is a screen magnifier utility.
gInk - An on-screen on-screen annotation software for Windows.
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.
ZoomIt - Presentation utility for zooming and drawing on the screen.
Gromit-MPX - Create annotations by directly drawing on your screen.