EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
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.
SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
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.
QuickRes - The best way to change resolutions on your Mac
Display Resolution Manager - Display Resolution Manager is an easy-to-use software that is providing a straightforward way to play around with your screen resolution and color settings.