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.
Acumatica - Acumatica is adaptable cloud accounting software and cloud ERP software for small to midsize businesses.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Unanet - Unanet provides resource management, project management, timesheets, expense reports and workforce collaboration.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Deltek Costpoint - Costpoint lets you manage the entire project lifecycle and control project costs.