Quiet is described as 'Push distractions aside, silence disruptions and enter a zen like state of focus with Quiet for Mac OS X. With the push of a button, silence noisy applications and fade out all unwanted windows. It gives you that moment of peace you need to get on with work' and is a anti procrastination tool. There are more than 25 alternatives to Quiet for a variety of platforms, including Mac, Windows, Android, iPhone and Linux. The best alternative is Forest, which is free. Other great apps like Quiet are SelfControl, StayFocusd, Freedom and Writebox.
SelfControl is a free and open-source application for Mac OS X that lets you block your own access to distracting websites, your mail servers, or anything else on the Internet. Just set a period of time to block for, add sites to your blacklist, and click "Start.
Freedom is an application that disables networking on an Apple computer for up to eight hours at a time. Freedom will free you from the distractions of the internet, allowing you time to code, write, or create.
Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad. Writebox helps you to concentrate on writing and seamlessly syncs your text writings across all your devices with Dropbox and/or Google Drive.
Hocus Focus automatically hides application windows that have been inactive for a certain period of time, leaving only the applications you’re using visible. It’s a great way to keep your screens clutter free and your mind focused on the task at hand.