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Dimensions Toolkit - Chrome Extension for designers to test responsive websites.
Screen Resolution Manager - Screen Resolution Manager is one of the robust and streamlined desktop applications that come with an easy way to adjust your screen resolution.
One Click Test - Tool for quickly testing your design layout in one click.
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
Flexbox Grid - Grid based on CSS3 flexbox
HRC – Hotkey Resolution Changer - If you are looking for a sumptuous desktop application that will overcome every bit of your need to adjust the brightness, resolution, and color contrast of your screen, then Hotkey Resolution Changer can be a smart option for you.