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.
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.
ZedCMS is a simple base content management system from which more complicated systems can be developed. It is designed so a Web developer can quickly produce customised websites, and is not really for users. Users wanting to setup their own websites are better off with a different system, like Wordpress.