**The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s. The time intervals were named pomodoros, the plural in English of the Italian word pomodoro (meaning tomato), after the tomato-shaped kitchen timer that he used as a university student.
There is a free level that offers 20 Pomodoro intervals a month. Try Focus Booster to see if keeping a timesheet improves your ability to focus.
There are many free apps available that may help you. Just do a Google Search with the string, "time management apps."