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Billboard is a dynamic accounting and billing software for Asterisk VOIP software with a web-gui frontend. It's light-weight and scalable. Requires no database.
OpenFakt is an open source Java invoicing and billingsystem using XML definition files for various forms (address book, articles, invoices, stock management). It is language, database and platform independent and aims at small to big companies.
gcdb is an aesthetically pleasing MySQL/PHP billing database. It supports Customer, Payment, Invoice, Account, and Trouble Ticket entries. Meant for ISP, Hosting, or general billing.