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.
Paymo - Manage projects, track time, create invoices, and get paid online.
Deputy - Deputy is a software for employee scheduling, time and attendance and communication management.
ManicTime - Track your computer usage and use collected data to accurately tag time.
QuickBooks Time - Easily track time for effortless payroll, invoicing, and job costing—without the paperwork, guesswork, or hard work.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.