Summer Cart shopping cart is fully search engine optimized, fully XHTML and CSS compliant, with Meta tags, search engine friendly URLs, SEO keywords and descriptions on every page.
* Full-featured online store
* Search-engine-friendly product catalog;
* Comprehensive orders management;
* Powerful CMS
* Google Checkout, wizard and anonymous checkout;
* Real-time credit card payments using PayPal, Authorize Net, 2Checkout;
* Offline payments with Collect On Delivery, check and credit card;
* Real-time shipping rates from UPS, USPS and FedEx;
* Free, flat-rate and table-based shipping;
* Built-in 39 currencies get updated daily;
* Multi-language store front and admin panel;
* Easily customizable
* 100% compatible with IE 6 & 7, Firefox 2 & 3, Safari 3 and Opera 9;
Summer Cart is 99% open source, uses PHP 5, MySQL and Apache, and is carefully designed to be secure, scalable and easy to maintain.
Check it out – register-free Online Demo.

Idut Shop is a simple and elegant open source PHP shopping cart for Google Checkout. It can be easily customised and incorporated into an existing website. Written in PHP, you can add products from the easy to use control panel this includes adding images and setting prices. Idut Shop for Google Checkout is simple to install and uses a MySQL database.

x-cart (xcart) is a continuously-develop and time-proved shopping cart software trusted and widely used by thousands of successful business owners worldwide. It supports almost unlimited number of products (including e-goods i.e. downloadable intangible goods) and categories. It requires no PHP or other programming language of the operator. ADMINISTRATION SIDE FEATURES: with the web-based administrator area, administrator can setup and modify the look & feel and functionality of the shop front, manage products and orders, keep real-time tracking of inventory, live-analytics and affiliate/referrer sales. Administrator can also promote products through discount coupon, gift certificates, quantity discounts, featured products, crossing selling in multi-categories, wish list, newsletter, e-mail notifications, send to friend section, wish list section. CUSTOMER SIDE FEATURES: customers can search & browse their personal order history, track their order, recover losing password, perform quick checkout without registration. GENERAL FEATURES: 1/multi-language, configurable currency symbol 2/ template-based storefront 3/ support for thumbnails, 4/ members-only categories, 5/ automatically currency conversion, 6/ configurable search by title, description, category, SKU, price and weight, 7/limit minimal order amount, 8/’out of stock’ messages, 9/ real-time USPS, FexEX and UPS shipping calculation from one location, 10/ unlimited number of custom-defined delivery methods, 11/ add handling/freight charges, 12/ automatic creation of shipping labels, 13/ export orders to quickbooks format, 14/ accept any currency payments, 15/ accept payment via Paypal, 2checkout, e-gold, google checkout, cheque processors, credit card and other online payments, 16/ all pages are search engine friendly, 17/ moderated product reviews and ratings, 18/ greet regular visitors, 19/ unlimited number of admin accounts, 20/ control the cart from anywhere in the world using your web browser, 21/ high security platform supporting full HTTPS/SLL, 22/ strong blowfish encryption for sensitive customer data, 23/ PGP-encrypted e-mail notifications, 24/ real-time security notifications of all failed login attempts, 25/ backup sub-system. (MyDLstore.com is an authorized reseller of x-cart (xcart) products)

A shopping cart
Built using web standards
Based on best practices in usability
Accessible
Search Engine Optimized
Easy to extend and style (all CSS)
Free (as in beer)
Open source (MIT license)
More about features

Find out whats going on on your site! NEW MODE: Follow customer, traffic monitor will SHOW you the page your customer is on in your own browser, and it will change pages as they change thier screen.

View live customer activity on your shop, see which pages they visit, how long they spend on the site.

Search engine KEYWORD tracking, tells you what people have typed into the major search engines to find your site for ANY time period. Perfect for optimizing your shop content for search engines and seeing what products people are interested in most.

Referrer tracking. See which sites send you visitors for any time period.

Campaign tracking, track clicks from your newsletters, from paid campaigns or simply from other sites.