No, not Shaun the sheep, this sheep:
WorkRave: Take a break and relax
Workrave is a free program that assists in the recovery and prevention of Repetitive Strain Injury (RSI). It monitors your keyboard and mouse usage and using this information, it frequently alerts you to take microbreaks, rest breaks and restricts you to your daily computer usage.
It may look quite oldish and you’re right as according to Wikipedia it was first released in 2002 but it still works fine. Just set up a micropause of 8 minutes, a break of 5 minutes every 25 and you essentially got the pomodoro technique plus prevention of RSI.