Time Out - Break timer with micro-breaks for Mac OS X.
Tomato Timer - TomatoTimer is a flexible and easy to use online Pomodoro Technique Timer
Breaktime - Break time is an app that reminds you to stand up every chosen amount of time.
Tasklog App - Tasklog App is an agile productivity software designed to meet the needs of current world freelancers.
stretchly - break time reminder app
YAPA - Pomodoro timer