Blesta is a powerful billing system, and is far more superior than the leading billing system WHMCS.
Automated Billing. Invoicing, service provisioning & suspension, payment processing, payment reminders, backups and more are all automated. Blesta creates gorgeous, professional looking PDF invoices, and sends them to your clients automatically. Invoices can be sent via email, fax, postal mail, or queued up for print and delivery by your staff.