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E-Commerce > Billing Systems
AgileBill Billing System
AgileVoice
AlstraSoft EPay Pro (Start Your Own Paypal Business)
BillingTimePro™
BugInvoicing Web Based Billing System
Client Invoicing for Webmasters
ClientExec
E-Gold Emulator / Sandbox
EPay Enterprise
EZ Invoice, Inc™
LogicBill
OrbitHYIP
osCPro ExV1
Payment Processing Script just Like PAYPAL:
PHP iManager 3.1
PHPInvoicer
Web Billing/Invoice System
webINVOICE-V1.10
webINVOICEplus-V2.10
X-AOM (advanced order management)