Arcavias is an e-commerce framework for Web shops, consisting of an e-commerce library, an administration interface, and different frontends. It's a modular stack which offers flexibility and speed. Unlike other Web shops, it's not a monolithic application. Instead, you have a choice between several user frontends, and you can adapt them to your needs or write one of your own.
flexi cart is a shopping cart library for CodeIgniter. While CodeIgniter comes with its own cart library, the library is quite basic in functionality and is only aimed at creating simple e-commerce stores. The flexi cart library includes the following features: shipping, taxes, localisation, discounts and reward points/vouchers, multiple currencies, item stock control, surcharges, saving/loading of incomplete carts for later shopping, multilingual custom status and error messages, and currency and weight conversion tools.
Magmi is a mass importer for the Magento e-commerce system. It is most useful when you need to import a big product catalog into Magento, even one with several millions of articles. Moreover, it has many capabilities concerning input data manipulation and an open and flexible plugin model for adding new capabilities.
Lightning Fast Shop (LFS) is an online shop and e-commerce solution. It installs in minutes and is ready to go out of the box. Some of it main features are variants and configurable products, related products, accessories, facetted navigation, packaging units, vouchers, and discounts, It provides variable shipping and payment methods, a one page checkout page, and much more.
mCommerce WebKit UI is a mobile commerce UI for WebKit-enabled mobile devices. It features intuitive searching and browsing, a streamlined sales funnel, conversion-friendly color scheming, easy customer support via native device functions (phone, SMS, and email), a touch-friendly minimal-click interface, accessible font and text rendering, and universal header and footer navigation.