On-Screen Ruler - lightweight, free, semi-transparent ruler
ZoomIt - Presentation utility for zooming and drawing on the screen.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
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.
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.
Zoomtext - ZoomText Magnifier enlarges and enhances everything on your computer screen, making all of your...