OpenSourceBilling
A super simple way to create & send invoices, receive payments online
...OSB can produce reports of sales, payments and collected revenues, and simply makes billing and invoicing hassle-free.
OSB comes with plenty of built-in features, such as recurring invoices, exporting to PDF, time tracking, receiving payments through Paypal and credit card, Freshbooks and Quickbooks data importing and more. It also supports several different languages as well as currencies.