XML editor
XML text markup for ancient documents
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
eXist-db is a feature rich Open Source native XML database
XML Schema for questionnaires and PDF questionnaire generator
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
professional open source software for LCA
xslet project provides some XSL libraries and applets.
GeoNetwork for AU/NZ users
A free universal Braille Transcriber
html5media is a DITA-OT plugin and authoring UI for media insertion