Sirix is a versioned tree-based storage system. It provides Snapshot Isolation through MVCC and is best suited for flash-based storage. The tree encoding is suited for heavy update operations. It provides diffing algorithms either to import diffs between currently shredded (imported) XML documents to update a tree structure or to get the differences between versions of a tree structure. A GUI provides several visualizations for comparing imported tree structures.
c_xml is a class that can convert between XML files and arrays or strings. It can parse an XML file into a DOM document object, so it can be returned as an array or displayed using a XSL stylesheet. The parsed XML document can also be manipulated to add, change, or remove nodes. Nodes may be searched using XPath. The resulting document can be regenerated in XML format.
betterFORM is an implementation of the W3C XForms 1.1 Recommendation. It allows easy creation of highly dynamic Web 2.0 user interfaces with attractive controls and layout. You can add validations, calculations, actions, and events to build complete Web applications in a declarative way.
xSiteable is a complete all-you-need package for creating sites that are fully relational, open source, fully templating-enabled, using only XML-based technologies to help you create complex sites on the fly. It packs such features as topic maps, notation for content, and the fast Sablotron xslt parser.
Jaxup is a Java library that defines an interface to update XML documents, through which clients can work without knowledge of the exact object model that the document uses. The interface is called Updater, and the idea behind it is the same as with Jaxen's Navigator interface. In addition, an implementation of xmldb.org's proposed XUpdate specification is provided. Jaxup supports DOM, JDom, and DOM4J.