A number of simple utilities for manipulating HTML and XML files. See INSTALL for generic installation instructions. Get the source at: http://www.w3.org/Tools/HTML-XML-utils/
a web-based service designed to make it easier to convert academic papers from typical word-processor editing formats such as MS-Word .DOC and OpenOffice .ODT, to publishing layout formats such as XML.
eXist-db is an open source database management system built using XML technology. It stores XML data according to the XML data model and features efficient, index-based XQuery processing.
Leo is... * A general data management environment. Leo shows user-created relationships among any kind of data: computer programs, web sites, etc. Leo shows multiple views of data within a single outline. * An outlining editor for programmers. Leo supports optional noweb and CWEB markup. * A flexible browser for projects, programs, classes or any other data. * A project manager. * Fully scriptable using Python. * Leo's outline files are XML format.