Stop learning proprietary languages and memorizing template tags. Symphony leverages open standards like XML and XSLT, and good old XHTML and CSS. Even the admin interface employs the widely-used jQuery library, so extension developers don’t have to learn a whole new framework when extending the back end.
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.
AtomicWiki is entirely based on the Atom Publishing Protocol and syndication format. All entries are stored as Atom feeds. The Atom Publishing Protocol is used to create and manipulate feeds and entries. The entire system is implemented in XQuery and XSLT with the help of some Javascript for the AJAX goodies (like in-page comment editing). What makes the software really powerful is its tight integration with XQuery and XML databases. Macros and extensions to the wiki syntax are implemented as XQuery functions. XQuery code can also be directly embedded into an Atom entry to generate dynamic content. The eXist weblog is powered by AtomicWiki.
ycoon is a Python WSGI web development framework which allows XML processing pipelines to handle HTTP requests based on URI pattern matching. It is similar in intention to the Apache Cocoon framework. Pycoon uses sitemap file format compatible with Apache Cocoon Sitemap