Workrave is a free software application intended to prevent computer users from developing or aggravating occupational diseases such as carpal tunnel syndrome and Repetitive Strain Injury (RSI).
The program frequently alerts you to take micro-pauses, rest breaks, exercise and restricts you to your daily limit. The software periodically locks the screen while an animated character, “Miss Workrave”, walks the user through various stretching exercises, and urges them to take a coffee break. This has a lot of customizable options.
Multiple users can install at work and this program runs distributed on one or more PCs. All connected PCs share the same timing information. When the user switches computers, he still will be asked to pause on time. This works on Windows XP, Vista, MAC, Linux, Unix and many others.