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EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
Dimensions Toolkit - Chrome Extension for designers to test responsive websites.
SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
One Click Test - Tool for quickly testing your design layout in one click.
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.
Flexbox Grid - Grid based on CSS3 flexbox