An educational digital environment that will provide appropriate methods and techniques for the support and enhancement of the educational and learning process is a valuable tool for both educators and learners. In the context of such a mission, the educational tool SL-EDGE (Student Library-Educational DiGital Environment) has been developed. The application employs, amongst others, a standardized metadata structure and collaborative filtering techniques in order to provide a set of educational services oriented towards users' needs for the discovery and reuse of educational resources for a reliable, efficient and effective assessment and also for communication, distribution and exchange of ideas and opinions. To this effect, it consists of two main modules: an educational digital library and an assessment tool for teachers and students. All the functions implemented are fully Web-based and the application deploys technologies, such as Java, JavaServer Pages and JavaBeans, transforming it to a powerful and robust educational tool. (Contains 30 references.) (Author)