stretchly - break time reminder app
Wellnomics WorkPace - WorkPace is one of the most sophisticated computer ergonomics packages available.
Workrave - Workrave is a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI).
Eyes Relax - Eyes Relax is a little free utility that reminds you about rest-time and save your eyesight. Eyes, relax, freeware, download.
RestStop - RestStop sits in your tray and gives you non-intrusive reminders to rest after you’ve worked...
Eyeleo - EyeLeo is a handy PC application that reminds you to take a break for your eyes.