Francis - Francis uses the well-known pomodoro technique to help you get more productive.
Productivity Challenge Timer - Productivity Challenge Timer app is a digital timer that helps you in focusing more on your daily task tracking time usage.
Session - Pomodoro Timer - Pomodoro timer w/ distraction blocking, journal & analytics.
Gnome Pomodoro - This GNOME app helps to manage time according to Pomodoro Technique.
focus booster - focus booster is a simple timer application following the 'Pomodoro technique' for time...
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.