Blesta is a multi-purpose, web based billing solution for client management: Create invoices & services, manage payments, handle support requests and more. Blesta's modular system allows it to interface with nearly any third party API, and ships with modules tailored for web hosting. Third party control panels like cPanel, DirectAdmin, Plesk, Enom, OnlineNIC, OpenSRS, and many more are supported, though ...
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.