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.
tinyTimeSheet - A basic time sheet for Mac.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
TimeCatcher - TimeCatcher is a small web app that allows you to quickly and easily generate branded, professional timesheets.
Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.
WorkTime.Expert - Let Time Work for You!