Web Business Manager is a backend PHP/MySQL application that allows control of all (or most) of the aspects of a business. This isn't a premaid script but is coded to your needs, so it can perform the actions you want. Custom is based on time it takes on developing the application. Over three of our clients already use the Web Business Manager for managing their websites and orders.
PHP S-Cart has become part of the Web Business Manager, allowing e-commerce sites a nice and easy solution to manage their online sales.