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.

AdworkTracker - Adworktracker is an intelligent time tracking software that takes real-time screenshots with user activity statistics on a regular interval of time.

Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.

Time Tracker - Employee scheduling software manages shift schedules, time off, attendance, absence and vacations. It analyses activity and prepares data for payroll. Explore our free-trial.

RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.

Employee Time Tracking Handbook - Track employee time the right way