XML editor
Development toolkit for Web Services and XML data bindings for C & C++
X3D is the open-standard format for 3D graphics scenes on the Web.
EasyML serialization library, to and from XML, similar to Gson
XMLJ is a Java XML Editor and validator project.
Production space for the TEI Linguistics SIG
XML text markup for ancient documents
XML Schema for questionnaires and PDF questionnaire generator
Simple C++ XML processing
eXist-db is a feature rich Open Source native XML database
Java based XSLT Processor extension for syntax highlighting
XML Application Framework based on JAVA
NO LONGER MAINTAINED
EXI implementations in Java and C#