This Mac program was designed for users who work with multiple applications at the same time and wish to arrange their windows in an optimal way on the Desktops. Arranger is very simple to handle, provides you with a comprehensive help manual, and offers you easy-to-configure settings.
The app sits on your Menu Bar from where you can change the screen position of Finder's or other program's windows, access the integrated help guide, and configure Arranger's settings according to your requirements. Also, from the main menu of the app you can enable the Arrange Windows option (the app automatically arranges the opened windows on the screen in the most optimal way).
However, if you ask me, the most important feature is the ability to define global hotkeys. By doing so, you save a lot of time re-arranging the opened windows within your screen by hitting several keys.
Furthermore, this program also offers you the option 'Windows Snapping'. After you enable this feature and drag-and-drop a window on the edge of the screen, the app automatically resizes and positions the window.
To conclude, I'd say it's worth installing this application on your Mac as long as you're working with multiple programs at once and need to organize their windows.