The lxml XML toolkit for Python
Development toolkit for Web Services and XML data bindings for C & C++
C++ library for creating XLSX files for MS Excel 2007 and above.
Simple C++ XML processing
eXist-db is a feature rich Open Source native XML database
Provides common classes, which can be used to parse news feeds
XML sendengine UTF8 in different formats Batchfunction
Support for XML text declaration handling