Epic Pen - A windows tool for drawing over your desktop and applications
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.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Magnifixer - Magnifixer is a screen magnifier utility.
PaintTool SAI - Learn to draw in different ways.
ZoomIt - Presentation utility for zooming and drawing on the screen.