Track your work hours in Google Calendar

Google Calendar is a free time-management web application offered by Google. Turn on Applets to add the most important information, right into your calendar, automatically — and get custom notifications about the events that matter the most to you.
Acuity Scheduling is your all-in-one appointment management tool. It's everything you need to schedule anything. Acuity Scheduling helps you automate everything from payments to reminders.