Moom is Many Tricks’ window moving and zooming app. If you find the behavior of the green zoom button mysterious and thus avoid using it, you’ll love Moom—hover over the green button, and a pop-up palette appears, letting you quickly choose from five built-in size/location options. But you can also create custom commands that will move windows to other displays, size and position them exactly as you wish, or perform many other actions, including centering. Finally, if you use one display at one location, but multiple displays elsewhere, Moom can memorize your open windows for both setups, and automatically switch to the saved layout when the display setup changes. Check it out at Many Tricks.