xcb-proto contains descriptions of the X Window System core protocol and selected extensions in an XML-based data format. They are used by the X C Binding (XCB) library to generate much of its code, but you can also use these descriptions for other purposes, such as decoding the X protocol or building X Window System bindings for other languages.
Apertium is a machine translation platform, initially aimed at related-language pairs, but recently expanded to deal with more divergent language pairs (such as English-Catalan). The platform provides a language-independent machine translation engine, tools to manage the linguistic data necessary to build a machine translation system for a given language pair, and linguistic data for a growing number of language pairs.
Yed is a C software library made of modules (objects) that can be instantiated according to the main paradigms of Object Oriented Programming: encapsulation and data hiding. The library contains objects that handle XML files and buffers, FTP connections, filesystem operations, and more.
Qexo (Query Expressions for XML Objects aka Kawa-XQuery) is an implementation of W3C's draft XML query language XQuery. XQuery is a high-level expression language whose values are sequences of nodes (as in DOM) and simple values. It includes syntax for embedding XML or HTML results, and a 'for' statement comparable to SQL's 'select'. This implementation uses the Kawa tools to compile XQuery programs to Java bytecodes that can run on any JVM. XQuery programs can run as servlets, as standalone applications, or from the command-line.
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.
YAPP XSLT is a recursive descent parser and lexical scanner generator (aka compiler compiler), implemented entierly in XSLT. The generated compiler stylesheets allow users to parse and process text content. The package also includes a BNF parser parser and left-recursion eliminator, and an example XPath grammar.