Magento offers an enterprise-class ecommerce platform, supported by a global ecosystem of solution partners and third-party developers. Acquired by eBay in 2011, Magento is part of eBay's X.commerce business unit.
Magento ecommerce gives merchants scalability and features for presentation, content and functionality. The platform offers marketing tools, search engine optimization, product catalog management and browsing, one-page checkout and a number of standard tools such as those used to manage shipping, tax and customer service.
The latest stable release of Magento Community Edition (version 184.108.40.206) was released on October 19, 2011. This free version is available under the open source OSL 3.0 license. Merchants looking for a more mission-critical ecommerce platform can upgrade the Enterprise Edition.
6. OpenCart: Manage Multiple Stores with One Admin Interface
The OpenCart shopping cart helps storeowners to quickly and easily install, select a template, add products and start taking online orders. The built-in template system lets you switch between different templates or migrate your site's current design into OpenCart.
Other cart features include a multi-store capability to manage multiple stores from one admin interface, tax zones, shipping methods, back-end store administration, and support for a number of payment gateways and languages.
OpenCart is free open source software published under the GNU GPL License and both free community and commercial support is offered. OpenCart server requirements include Web Server (preferably Apache), PHP (at least 5.2), MySQL, Curl and Fsock.
7. osCommerce Online Merchant: Provides Front and Back-End Tools For Store Owners
The osCommerce Online Merchant ecommerce solution is a free offering that comes with features and tools to help storeowners manage the front-end catalog and back-end administration.
Released under the GNU General Public License, osCommerce Online Merchant v2.3.1 provides a basic template layout structure to customize the catalog front-end. The Administration Tool lets merchants configure the online store, insert products for sale, manage customers and process orders.
There is a large community of more than 256,000 storeowners, developers, service providers and enthusiasts contributing to the help, support and development of osCommerce. Other support options include mailing lists and the osCommerce Newsletter for storeowners. Server requirements include PHP v4+ (PHP v5+ recommended) and MySQL v3+ (MySQL v5+ recommended).
8. PrestaShop Features Multiple Languages and Localization Options