SwitchRes X
Allows more than the standard screen resolutions, for connecting external monitors to an imac for example
Basically, it helps you manage the resolution of all your monitors. You can access to the resolutions of all your displays in a simple, customizable menu. You can most of the time enable more resolutions than what the system allows you to use, from the SwitchResXpreferences panel. SwitchResX incorporates features relative to the Monitor Resolution, Monitor BitDepth, and Video Mirroring into one single utility. You can use its menu in the Menu Bar or click on the Finder Desktop with its Contextual Menu Plugin to gain access to all these settings from within every application.