The eXtensible Text Framework (XTF) is a powerful open source platform for providing access to digital content. Developed and maintained by the California Digital Library (CDL), XTF functions as the primary access technology for the CDL’s digital collections and other digital projects worldwide.
XTF consists of Java and XSLT 2.0 code that indexes, queries, and displays digital objects
SADE tries to meet the requirement for an easy to use publication system for electronic resources and Digital Editions. It is an attempt to provide a modular concept for publishing scholarly editions in a digital medium, based on open standards.