Circloscope

Circloscope is an extension of Google Chrome which helps you with your Google+ circles in various ways. It comes in 3 editions: Circloscope Free (Inactives+) to find and remove inactive people from your circles, Circloscope Free (Uncirclers+) to find and remove people who are in your circles but have not added you back to their circles, and Circloscope Premium ($5) as an all-in-one circle management tool for power G+ users. All editions have a built-in tour for beginners! By the way, Premium edition can be used as trial with certain limitations in functionality.