https://www.billingboss.com/• Billing Boss allows anyone from freelancers to a small businesses to quickly and efficiently bill clients with an unlimited number of invoices. This app lets you add as many clients as you need to your database and help you stay organized by instantly saving and cataloging you invoices. Billing Boss seamlessly integrates with Paypal so you can reach clients worldwide with its great support for multiple currencies.
http://www.simpleinvoices.org/• Simple Invoices, a static web-based invoicing application that allows itself to be installed on a web-sever or a Windows PC. It can also be hosted by one of the following service providers as well.
http://lessaccounting.com/• Not only can you invoice but you can easily keep track all of your business expenses with LessAccounting. You can put organize your expenses into categories, add notes and even upload a pictures of your receipts for each expense.
http://www.blinksale.com/• Blinksale is a great looking web application that has a powerful feature set. Blinksale has a quaint option that allows you to send invoices via snail-mail, whatever that is! You can also customize your invoices by uploading your very own logo or if you have some time on you hands design your own invoices with CSS.
http://www.getcashboard.com/• Quickly invoice for time logged against a project, materials, or other goods. Create invoices for your projects with one mouse click, or set up recurring invoices to bill your customers automatically.
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