We have worked with many cart products over the years. Software is constantly changing, and features get better and better.
A few of the latest ecommerce products we have been working with lately are VirtueMart, ZenCart, and X-Cart.
VirtueMart
VirtueMart is an Open Source E-Commerce solution to be used together with a Content Management System (CMS) called Joomla! (but also works with Mambo). Joomla and VirtueMart are written in PHP and made for easy use in a PHP / MySQL environment.
Zen Cart
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.
Some shopping cart "solutions" seem to be complicated
programming exercises instead of responding to users' needs, Zen Cart™
puts the merchants and shoppers requirements first. Similarly, other
shopping cart software programs are nearly impossible to install and
use without an IT degree, Zen Cart™ can be installed and set-up by
anyone with the most basic web site building and computer skills.
There are hundreds of shopping cart programs available, but none come close to offering the level of options, features and support available with Zen Cart™. Even the commercial programs have a hard time competing.
X-Cart
Shopping cart software trusted by thousands of successful business
owners worldwide. Web-based administrator area and installation wizard
make setup and maintenance of the shopping cart as easy as point and
click. 24x7 technical support is available to guarantee smooth launch.
No PHP or other programming knowledge is required to set up and run a
world class online store.
X-Cart is template based software with open source code. This means you can modify the look & feel and functionality of the shopping cart the way you need should you require any business specific features.
The software has no logical limitations on the number of products. The code is optimized for smooth performance with up to 20 000 products. Due to the fact that performance depends on server configuration special hardware and software optimization allows X-Cart to run with up to 500 000 products.
All of the above makes X-Cart one of the best shopping cart systems in the world.