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.
XMLJ is a Java XML Editor and validator project.
Production space for the TEI Linguistics SIG
EasyML serialization library, to and from XML, similar to Gson
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NO LONGER MAINTAINED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#