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Re:Pause Me – Apply the 20-20-20 rule to prevent eyestrain w... by bbguitar on Monday April 20, 2015 @04:43AM (#9406820)
For Linux - workrave http://www.workrave.org/
Re:Pause Me – Apply the 20-20-20 rule to prevent eyestrain w... by 1wd on Monday April 20, 2015 @05:08AM (#9406878)
Can also recommend workrave for Windows.