Apps similar to DOA - Device Optical Aid include Magnifixer, which is free. Other options are OneLoupe, Virtual Magnifying Glass, Lens (Magnifier) and Magnus - Screen Magnifier. In total there are five Screen Magnifiers like DOA - Device Optical Aid for Windows, Linux and Mac.
Magnifixer is a screen magnifier utility. You can place it anywhere on your screen, make it any size you want and select a zoom level. Magnifixer will always show the area of your screen where the mouse cursor resides.
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OneLoupe is a customizable screen magnification tool. It runs in the system tray and can be activated by clicking on the icon or setting a HotKey.
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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.
Whenever single-pixel-accuracy is required, Lens will assist you by magnifying the area around the mouse pointer.
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