Miva Merchant is a browser-based shopping cart development tool.  Miva Merchant offers one simple package containing all of the necessary E-commerce elements: cataloguing, product maintenance, category management, shopping basket, order and credit card processing.

Multiple online stores can be maintained by one administrator to simplify and centralise your E-commerce operations, or specific areas of store management can be delegated to others.  Merchants run their stores through a web control panel and the browser-based interface allows developers to build and administer stores and also get under the hood and "tweak" the code to fit the exact needs of the store owner.

Features
•    Online Credit card authorization
•    Completely customisable "look and feel" for user interface
•    SSL integration for secure ordering and order processing
•    Hierarchical, nestable categories
•    Offer up-sell products based on basket contents
•    API-based replaceable modules, developers can create new modules as needed
•    Fully Scriptable, XML compatible source code included
•    Detailed product attribute configuration
•    Multiple and unlimited sales tax setup
•    Multiple and unlimited shipping methods with automatic online UPS shipping calculations
•    Configurable currency layout
•    Batch and archival management of orders with e-mail notification when orders placed
•    Quick installation and auto data file setup
•    Database driven, modular architecture with ability to set up multiple stores
•    Context sensitive online help and tutorials    

Price
$30 per month 

Store Front

http://smallbusiness.miva.com/products/demo/mm5/merchant.mvc

Admin demo