Workrave - Workrave is a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI).
Time Out - Break timer with micro-breaks for Mac OS X.
stretchly - break time reminder app
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Eye Break - eyeBreak is a tiny app designed to sit in the Windows tray and provide a non-ignorable message...
StretchMinder - Work break timer with guided movement & breathing exercises