PrestaShop is professional e-Commerce shopping cart software that you can download and use for free. It is web 2.0 based and extremely lightweight, so it runs very fast even on a shared server.

Having a very powerful back-end, store admins can manage the inventory, orders, customers & payments easily. System never limits you as it supports unlimited categories, sub-categories & image pictures. Sub-admin users can be created with different permissions so when someone can only track the inventory another admin can be limited to processing the orders.
Prestashop Website: Click here to visit website

Latest Version: 1.2.4
Price: FREE

Featured Sites:
Bagatelles
Abiessence
Marcel Green

Contact Prestashop RESTASHOP
6 rue Lacepede
Paris, 75005
FRANCE

Übercart is a complete, Drupal e-commerce solution. Check out the Übercart project page at Drupal.org. The developers of this fine looking piece of e-commerce goodness call it an escape from osCommerce. (Is it also an escape from Zen Cart – the previous osCommerce exit strategy?) The best news is that it is a collection of Drupal based modules – not a hack in – that will allow other great development options for an e-commerce website:
Content development
Several great options for ratings and reviews
Discussion forum
Community development
Flexible theming possibilities
The list goes on…
Uber Cart Website: Click here to visit website

Price: Free

Featured Sites:
Ben Simon
West Paw Design
Blue Point Security

Contact Uber Cart: Ubercart Forum

Zen Cart is a PHP/MySQL open source shopping cart. It is completely free, and comes with source code which you can freely modify. The software is developed by a community effort. The code is based on the popular osCommerce shopping cart. The goal of the Zen Cart project is essentially to make an easier to use version of osCommerce which can be installed more quickly, modified more easily and have a more usable configuration out of the box. Being a community effort, many of its users are very passionate about this cart, and are constantly developing add on modules.

Price: Free
Latest Version: 1.3.8

Featured Sites:
Floracopeia
Moissanite Co
Isabel Harris

Contact Zencart: Zencart Community Forum
Zencart Website: Click Here

Interspire Shopping Cart touts itself as being the most feature-packed easy-to-use shopping cart around. Formerly known as Interspire StoreSuite, the software package includes everything you’ll need to create, run, market and profit from your online ecommerce venture. Interspire is well known for development of products such as Email Marketer, Knowledge Manager and WebEdit, but the new version of their shopping cart promises to be a complete ecommerce solution right out of the box. Here’s a breakdown of the features included in Interspire Shopping Cart:

Store Design Templates
Drag and Drop Design Mode
Simple Shipping and Payment Gateway Integration
Multiple built-in inventory tracking options
The ability to sell physical or digital products
Fast page loads due to extensive AJAX programming
Variations of products each with unique pricing, stock, images, etc.
Integration of SendStudio and Knowledge Manager for email marketing and FAQs

Price:
Starter Edition $295
Professional Edition $995
Ultimate Edition $1795

Refund Policy: 60 day, no-questions-asked refund guarantee

Latest Version: Interspire Shopping Cart 5.0

Contact Interspire:
Interspire Inc
9606 N. Mopac, Suite 960
Austin, TX 78759
United States
sales@interspire.com
1800-939-5570

Inspire Website: Click here to visit website

osCommerce is an open source e-commerce solution under on going development by the open source community. Its feature packed out-of-the- box installation allows store owners to setup, run, and maintain their online stores with minimum effort and with no costs involved. You can easily install osCommerce on your website with the help of the Fantastico auto-installer. Although the oscommerce is not the “ultimate” e-commerce solution, it is by no means “basic”; with the capabilities of customizing to meet the specific needs of ones own business.

osCommerce Website: Click here to visit website

Price: FREE
Latest Version: osCommerce Online Merchant v2.2 Release Candidate 2a
Community Support: http://forums.oscommerce.com/

Magento Commerce is an open source eCommerce shopping cart platform brought to you by a company called Verian. The shopping cart is quite feature rich out of the box, and is positioned to be the de-facto standard for open source eCommerce platforms.

Pricing: $0 – $8,900/year
Magento Commerce comes in 2 flavors: The Community Edition which is available as a free open source download, and the feature rich Enterprise Edition which costs $8,900 a year.
Latest Version: 1.3.2.3

For further reading:

• Magento Commerce – A First Look
• Magento eCommerce Review: Platform Perils and Impressions, Three Months In
• The PeC Review: Magento is the Open Source Powerhouse
• 25 Magneto templates for your ecommerce business

Contact Magento:

http://www.magentocommerce.com/
11832 W. Pico Blvd. Los Angeles, CA 90064
Enterprise Sales
+1 (310) 594-7638 (N. America)
+44 20 3286 4137 (UK)