Code Synthesis has released xsd 1.1.1, an open source (GPL) W3C XML Schema langauge based data binding tool for C++. This is a bug fix release.
Daniel Veillard has released version 2.6.21 of libxml2, the open source XML C library for Gnome. He's also released version 1.1.15 of libxslt, the Gnome Project's XSLT library for C. These releases fix assorted bugs and may run a little faster.
Toni Uusitalo has posted Parsifal 0.9.3, a minimal, non-validating XML parser written in ANSI C. The API is based on SAX2. 0.9.3 can treat validation errors as non-fatal and adds the xmlplint command line tool. Parsifal is in the public domain.
Diomidis Spinellis has released bib2xhtml 2.20, a free-as-in-speech (GPL) program that converts BibTeX files into XHTML 1.0+CSS.
Todd Ditchendorf has released XML Nanny 1.0, a free-as-in-beer Mac OS X "tool that provides an Aqua interface for checking XHTML and XML documents for Well-Formedness and Validity either locally or across the network."