eyeBreak is described as 'tiny app designed to sit in the Windows tray and provide a non-ignorable message reminding you to take a break from what you are working on'. There are more than 25 alternatives to eyeBreak for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and BSD. The best alternative is stretchly, which is both free and Open Source. Other great apps like eyeBreak are Workrave (Free, Open Source), Eyes Relax (Free), Safe Eyes Linux (Free, Open Source) and Eyeleo (Free).
Twenttty makes following the 20-20-20 rule by optometrists a breeze. It notifies you about taking a 20 second break every 20 minutes of your screen activity and asks you to look at something far away (at least 20 feet) to relax eye muscles.
A page that reminds you to take an eye break every 20 minutes. The 20-20-20 rule: every 20 minutes look at something at least 20 feet away for 20 seconds. Every 20 minutes a notification will remind you to do just that.