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osCommerce is a complete online store solution that contains both a catalog front end and an administration tool backend. It is FREE with Plans 1, 2 or 3  order now

Features:

• General Functionality
  • All features enabled by default for a complete out-of-the-box solution
  • Completely multilingual with English, German, and Spanish provided by default 
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• Administration / Backend Functionality
  • Supports unlimited products and categories
    • Products-to-categories structure
    • Categories-to-categories structure
  • Add/Edit/Remove categories, products, manufacturers, customers, and reviews
  • Support for physical (shippable) and virtual (downloadable) products
  • Administration area secured with a username and password
  • Contact customers directly via email or newsletters
  • Easily backup and restore the database
  • Print invoices and packaging lists from the order screen
  • Statistics for products and customers
  • Multilingual support
  • Multicurrency support
    • Automatically update currency exchange rates
  • Select what to display, and in what order, in the product listing page
  • Support for static and dynamic banners with full statistics 
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• Customer / Front End Functionality
  • All orders stored in the database for fast and efficient retrieval
  • Customers can view their order history and order statuses
  • Customers can maintain their accounts
    • Address book for multiple shipping and billing addresses
  • Temporary shopping cart for guests and permanent shopping cart for customers
  • Fast and friendly quick search and advanced search features
  • Product reviews for an interactive shopping experience
  • Foreseen checkout procedure
  • Secure transactions with SSL (SSL is FREE and included with ANY plan)
  • Number of products in each category can be shown or hidden
  • Global and per-category bestseller lists
  • Display what other customers have ordered with the current product shown
  • Breadcrumb trail for easy site navigation 
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• Product Functionality
  • Dynamic product attributes relationship
  • HTML based product descriptions
  • Automated display of specials
  • Control if out of stock products can still be shown and are available for purchase
  • Customers can subscribe to products to receive related emails/newsletters 
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• Payment Functionality
  • Accept numerous offline payment processing (cheque, money orders, offline credit care processing, ..)
  • Accept numerous online payment processing (2CheckOut, PayPal, Authorize.net, iPayment, ..)
  • Disable certain payment services based on a zone basis 
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• Shipping Functionality
  • Weight, price, and destination based shipping modules
  • Real-time quotes available (UPS, USPS, FedEx, ..)
  • Free shipping based on amount and destination
  • Disable certain shipping services based on a zone basis
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• Tax Functionality
  • Flexible tax implementation on a state and country basis
  • Set different tax rates for different products
  • Charge tax on shipping on a per shipping service basis

Payment Gateways Supported:

SSL Secured Forms (FREE with ANY plan):

SSL allows you to store secured forms.  When users will submit any secured form stored under your SSL secure account area, the contents of the form will be encrypted, and transmitted over the Internet back to you in a secured way.
The SSL feature is FREE, and it is included by default with ANY plan