1)   InstantInvoice 3 3.4.8
Invoicing and billing software for the small business. Very fast setup and easy to use. Preview and print powerful reports and charts instantly like invoice listings, sales by customer, outstanding invoice list, customer statements and more.

 2)   Excel Invoice Manager Express 2.5.1008
Seamlessly integrated with Excel, Excel Invoice Manager provides a true What You See Is What You Get invoice template, allowing you to manage customers, products, invoices and payments easily.

 3)   Excel Invoice Template 1.1
Excel Invoice Template, a billing software & invoice software based on Excel, provides a Fill In The Blank invoice form and is capable of creating and calculating invoices. See http://www.office-kit.com for more information.