FusionInvoice - Self hosted invoicing for freelancers and small businesses
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.
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Bahaquote - Bahaquote offers complete online invoicing and billing software designed to seamlessly integrate with any business.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.