Prevent eye strain - 20 20 20 rule reminder or screen blackout
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Stefan Matthießen
Eye strain from computers and other digital devices can be uncomfortable. The 20-20-20 rule may help you avoid eye strain along with decreasing your time spent looking at screens. Even if the strain feels severe it will likely not cause permanent damage to your vision. And your symptoms should subside once you rest your eyes.
Will Goto
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Bob Marley
check out stretchly, free and open source: https://hovancik.net/stretchly/
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Spencer Ericson
This is something I value, but Time Out already provides this service for me on Mac.