Magnus 
A simple desktop magnifier for Ubuntu and other Linux OSes.
About Magnus
Magnus is a very simple desktop magnifier, showing the area around the mouse pointer in a separate window magnified two, three, four, or five times. Useful for users who need magnification, whether to help with eyesight or for accurate graphical design or detail work.
Downloads
Development by Stuart Langridge. Packaging and assistance by Martin Wimpress. Source on Github.