From Bucket o'Mac:
The original idea of the Arranger was to resize and move the windows of your running applications automatically. You don't want to set up which window should be arranged in which way - let an app do the work for you. And that is what the Arranger does, it looks which apps are currently running and resizes and moves their windows in the best available way.
Another feature is, that you can create or arrange Finder windows whenever you need one, even when the Finder is not the active application. To be able to move files easily between Finder windows, you can use a Finder Split, that means two Finder windows will be arranged or created.
These are the features I missed in other window management apps, so I created the Arranger. And of course, you can arrange the window of your active application, too. To execute a function, click on it in the menu or use a shortcut, which can be defined in the preferences. You can set margins, the width for centered windows and exclude apps from being arranged, too. For more details take a look at the next sections or watch the demo videos.