Linux-Based Billing And Business Application Server For FREE use.
Open Source Openbravo POS convert to Commercial Retail ERP and POS
Open Source Integrated Hospital Information Management System
QRK Registrierkassen Software für kleine Betriebe.
A basic PHP/MySQL/HTML Billing APP. Meant for developers learning.
Small Business Appliance
Invoice and office utilities program for customer managment
jBilling is a web-based enterprise billing system.