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One Click Test - Tool for quickly testing your design layout in one click.
SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
Dimensions Toolkit - Chrome Extension for designers to test responsive websites.
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
AMP Templates - Beautiful, responsive AMP templates. Builder included.
Resolutionator - Resolutionator makes it simple to use any of your display's available resolutions.