Ecwid is a widget or plug-in style cart. The Basic plan is FREE and allows you to cut and paste a snippet of HTML code into your web page and then manage your store and products from their online interface. This type of functionality allows you to sell products on multiple sites and manage the store from one control panel. The solution also integrates with multiple social networks platforms and sites such as WordPress, Joomla, Facebook, MySpace and more. This plan limits the maximum number of products to 100.
Ecwid also offers a Silver plan with increased products, coupons, affiliate features, custom domain, SEO and more.