1)   Break Reminder 3.8.8
Break Reminder is designed to prevent and assist convalscence of OOS/RSI. Runs in the background monitoring computer use, giving appropriate pause and/or break reminders. Highly user configurable. Logs events. Many users around the World love it.

 2)   Break Time 1.4.50
New OOS and RSI Prevention Software. Break Time tells you when you should take a break. Transparent information window appears level on account of your weariness. The program keeps track of the time you spend on the computer.

 3)   workSafe 2.5.21
workSafe is designed to protect employees and employers from the loss of productivity and healthcare costs associated with repetitive stress injuries (RSI). The software monitors PC users, advises for breaks and alerts those at high risk of RSI.

 4)   WorkPause 1.4
The WorkPause utility can help you prevent the tiredness, back pain, eye strain, repetitive strain injury (RSI) or other illnesses provoked by long uninterrupted work with computers, by reminding you to take breaks at regular intervals.

 5)   SoundTimer 1.4
SoundTimer is simple and flexible short-term task scheduling utility. It can perform "open", "play", "execute", "print", "queue", or other actions on documents or programs, scheduled in seconds, minutes, hours, or days. Automate repetitive tasks!

 6)   Albion StopNow! 3.3
Taking regular breaks to avoid RSI problems can be hard without help. Albion StopNow! monitors your computer and gives you a discreet reminder if it finds that you have worked for too long without taking that necessary break.