iSnap is a Menu Bar application developed for Mac users who are looking for a simple and quick way to manage windows within their desktops. By hitting certain combinations of keys you can change the position of other apps' windows on your screen.
Within the menu of this program you can select the type of arrangement you need and a window will immediately move to the indicated screen area. You can also use the key combinations revealed within the Shortcuts menu.
The option I like the most is Shake. After shaking the window you're working on, iSnap will quickly hide any other app's screen from your desktop. This way, you can stay focused on your work, without being distracted by the windows of other running programs.
Another advantage is the fact that this application uses a very small amount of CPU resources while running on your Menu Bar.
Cutting a long story short, I'd say it's worth installing this free program on your Mac. It's very simple to handle, comes with simple-to-configure settings, and immediately applies window position changes.