Dragnifier is a freeware widget application that's light on system resources, powerful, easy-to-use and customizable.
Here are some screenshots to illustrate the features and user interface of this application:
A lightweight yet powerful magnifying glass. Screenshot of Dragnifier - 1516px · 1005pxSmall utility which helps magnify areas of desktop screen. Screenshot of Dragnifier - 1093px · 890pxDragnifier: User interface. Screenshot of Dragnifier - 1114px · 382px