The lxml XML toolkit for Python
Development toolkit for Web Services and XML data bindings for C & C++
XML editor
Fast XML parser library in C
Download, save and convert multiple subtitles from YouTube videos
X3D is the open-standard format for 3D graphics scenes on the Web.
EasyML serialization library, to and from XML, similar to Gson
Web Application Server Stack for Delphi/FreePascal/Lazarus
XMLJ is a Java XML Editor and validator project.
Production space for the TEI Linguistics SIG
Minimalistic address book in web browser. No server or plugin needed.
XML text markup for ancient documents
XML Schema for questionnaires and PDF questionnaire generator
eXist-db is a feature rich Open Source native XML database
Simple C++ XML processing
Simulatoralive's Java libraries and programs