easyrec is a recommender system that aims for easy integration of recommendations into web applications. It has a web based admin tool, and its recommendation engine is accessible through a REST API, providing methods like 'other users also bought'
The project consist in an open source implementation of the W3C Recommendation of the XML Key Management Specification 2.0 XKMS 2.0. It is compound of a XKMS Server and a Client API to access to the Server via Web Service.