Invoice Dude is hosted software to bill your clients securely without any setup. Although many tools exist like this, it is free to use software. It understand how difficult it is to setup payment gateways on your website and then managing the list of so many invoices, also, sending them to clients whenever they request this is all troublesome. It takes care of all those troubles for you.
[advt]All your data is stored in a secure database servers which are owned exclusively by you. No one else can access your data without permission. You can import your clients directly from Microsoft Outlook CSV.