Linux

Level Four Storefront offers a unique shopping cart solution being entirely Flash based.  Cart features include SEO, support for mobile devices and ipad/IOS, full gateways, coupons, product downloads, live shipping rates, plus an admin console built on the Adobe AIR platform.

Cube Cart 3 is a free hosted solution that runs on servers with PHP and MySQL. The software license is free however the  copyright removal is $90.00.

CS-Cart is a comprehensive ecommerce software solution with easy-to-use interface that allows you to start selling online immediately. It's feature set worls well for  small single-product shops to full-featured on-line stores. Designed for ease of use along with flexibility, CS-Cart is equipped with the latest ecommerce innovations (like one-page checkout, AJAX-based web interface, block manager and others) built into a highly configurable sales and promotion engine.

Avactis is a PHP based shopping cart available as a purchased solution for $249 - $449 or as a hosted solution for $19.95 - $99.95/month.

E-junkie provides shopping cart and buy now buttons to let you sell downloads and tangible goods on your website, eBay, MySpace, Google Base, CraigsList and other websites using PayPal Standard, PayPal Pro, Google Checkout, Authorize.Net, TrialPay, ClickBank and 2CheckOut.

Shopping cart software solution integrated into Dreamweaver - Frontpage - Expression Web - Golive - CSS ecommerce templates with ASP and PHP versions.

X-Cart is template based software with open source, PHP/MySQL code and can list an unlimited number of products.

X-Cart is template based software with open source, PHP/MySQL code and can list an unlimited number of products. X-Cart PRO differs from X-Cart Gold in that it is a solution which allows multiple companies to sell their products online. One store owner can let multiple third-party sellers use their store.

LiteCommerce is a free solution that can work as a standalone online store or in connection with Drupal CMS with tons of ready-made Drupal modules.

E-commerce solution that is flexible, reliable, expandable and easy to use. Miva Merchant is a well established solution with many add-ons and a significant development community to rely on.