Spree is a full featured commmerce platform written for the Ruby on Rails framework. It is designed to make programming commerce applications easier by making several assumptions about what most developers needs to get started. Spree is a production ready store that can be used “out of the box”, but more importantly, it is also a developer tool that can be used as a solid foundation for a more sophisticated application then what is generally possible with traditional open source offerings. You can find out more by visiting the Spree ecommerce project.