In this case, i will describe about 8 Best open source Shopping Carts that gonna make your online shop easier. The list is below…

1. Prestashop (homepage: http://www.prestashop.com/)

Download: Prestashop
Description: PrestaShop is an Open Source ecommerce web application. v1.0 was released on July 31, 2008. It was founded in Paris, France, by Igor Schlumberger and Bruno Lévêque.

PrestaShop is available under the Open Software License version 3.0. It is simpler but faster alternative to Magento, making use of an Ajax interface.

2. OpenCart (homepage: http://www.opencart.com/)

Download: OpenCart
Description: OpenCart is an open source PHP-based online shopping cart system. A robust e-commerce solution for Internet merchants with the ability to create their own online business and participate in e-commerce at a minimal cost.

OpenCart is designed feature rich, easy to use, search engine friendly and with a visually appealing interface.

3. Magento (homepage: http://www.magentocommerce.com/)

Download: Magento Commerce

Description: Magento is an Open Source ecommerce web application launched on March 31, 2008. It was created by Varien, building on components of the Zend Framework.^[1]

Magento is available under the Open Software License version 3.0. Since version 1.1.7 some parts are licensed under the Academic Free License version 3.0^.

Magento Enterprise Edition, a paid for version of Magento aimed at larger companies, was launched on April 15, 2009.

4. CubeCart (homepage:http://www.cubecart.com/)

Download: CubeCart
Description: CubeCart is a free-to-use eCommerce software solution, designed to allow individuals and businesses sell tangible and digital goods on line. CubeCart is not Open Source software, although full source code is available at no cost, and the custom licensing model allows for customisation of the code.

5.  AgoraCart (homepage:http://www.agoracart.com/)

Download: AgoraCart
Description: AgoraCart is another very popular online shopping cart, written in Perl/MySQL. It features a css manager so you can edit the look of your cart online. AgoraCart also features unlimited product options, up to 4 different tax zones at the same time, tons of shipping and payment gateways/options. The setup options range from a simple template based store to the integration of a complex visual design and support for program modification.

6. Zen Cart (homepage: http://www.zen-cart.com/)

Download: Zen Cart
Description: Zen Cart™ truly is the art of e-commerce; free, user-friendly, open source shopping cart software. The ecommerce web site design program is being developed by group of like-minded shop owners, programmers, designers, and consultants that think ecommerce web design could be and should be done differently.

7. osCommerce (homepage: http://www.oscommerce.com/)

Download: osCommerce
Description: osCommerce has attracted a large growing e-commerce community that consists of over 209,100 store owners and developers who support each other and extend osCommerce Online Merchant with add-ons being contributed on a daily basis. To date there are over 5,400 add-ons that are available for free to customize osCommerce Online Merchant online stores and to help increase sales.

8. StoreSprite (homepage: http://www.storesprite.com/)

Download: StoreSprite
Description: StoreSprite is a powerful, free php/mysql shopping cart easy to install, customise and maintain, no complex scripting to negotiate, design and deploy a top rate store that your client can manage with little or no training.