Invoice Ninja helps you send professional invoices
in order to receive online payments. There is a gateway credit card processor
that you can choose to make this very simple, including the use of PayPal. Your
edited invoice can be previewed live so you'll have a clear view of what the
PDF file will look like when it arrives in your customer's hands. This open
source code is free and able to be edited at any time in order to fit with your
website's needs. Using this application for your plan, you can send up to 500
and invoices a month without paying any additional subscription fees.