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- E-Pay is an open source invoicing application that allows you to create, edit, and organize your invoices and clients. Your clients can login to view and pay their invoices. Payments can be entered and the total will adjust accordingly. The invoice status can be updated to reflect payments made. There is a printer-friendly link so clients can print a copy of their invoice. There is also support for quotes. E-Pay is built with standards compliant HTML and features a very user-friendly interface.