FreshBooks - The ideal accounting software for small business owners.
Worksnaps - Worksnaps is a unique service specifically designed to track time for remote workers, telecommuters and freelancers.
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
OfficeTime - OfficeTime is a time and expense keeping utility for Mac, PC, iPhone and iPad. We also offer invoicing and reporting in an easy to use UI.
Zoho Books - Smart Accounting for Growing Business
TimeStatement - A simple time & expense tracking software with powerful invoice & report generation, best Excel alternative / extension, timesheet...