The lxml XML toolkit for Python
Fast XML parser library in C
X3D is the open-standard format for 3D graphics scenes on the Web.
XML editor
XMLJ is a Java XML Editor and validator project.
Development toolkit for Web Services and XML data bindings for C & C++
Download, save and convert multiple subtitles from YouTube videos
Production space for the TEI Linguistics SIG
Web Application Server Stack for Delphi/FreePascal/Lazarus
EasyML serialization library, to and from XML, similar to Gson
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