XTF

XTF, or eXtensible Text Framework, "is a powerful open source platform for providing access to digital content". XTF is a combination of Java and XSLT coding that actively categorizes, searches, and displays digital objects. XTF facilitates such end-user functions as searching using Boolean commands or wildcard operators, performing structure-aware searches, and creating RSS feeds from search results. XTF is easy to deploy, easy to configure, and extremely robust as it is "optimized to perform well on large documents". XTF is extensible: allowing developers to integrate a variety of authentication systems and modular components. Developed by the California Digital Library (CDL), XFT "functions as the primary access technology for the CDL’s digital collections" and is regularly "maintained and supported by CDL developers".