In this demonstration, we present a flexible system that enables the provision of personalized functionalities to digital libraries. The system has been developed based on the needs of The European Library portal and will be demonstrated in that particular context, but could be applied more generally. It implements a broad set of data processing, analysis, and mining techniques over the portal’s log files, using an environment called madIS. It enables on-line result contextualization and adaptation through the development of REST web services, which are responsible for retrieving and appropriately integrating the extracted information. The demonstration also features a web-based visualization tool for showing the output of the log analysis performed.