The lxml XML toolkit for Python
XML editor
Production space for the TEI Linguistics SIG
X3D is the open-standard format for 3D graphics scenes on the Web.
Parse and decode METAR, TAF, SYNOP, BUOY, AMDAR and write data as XML
Development toolkit for Web Services and XML data bindings for C & C++
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
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
Represents JSON doc as a nodes tree for transforms like XPATH & XSLT.
Java based XSLT Processor extension for syntax highlighting
professional open source software for LCA
XML Application Framework based on JAVA
xslet project provides some XSL libraries and applets.
Framework for search and display of heterogenous document collections.