We are fans of the Pomodoro technique. A lot of people are practicing it at work every day. There are several awesome timer tools but the best one is Marinara timer.
Founder - Student Maid
1%Stacklist Startups Are Using Marinara Timer
Marinara Timer is a Pomodoro-style timer you can tailor to fit your productivity needs. You can set time segments that fit your workflow, reduce distractions and share your productivity timer with teammates to complete tasks more efficiently.
Visit the website: http://www.marinaratimer.com/