Tim Bray has posted an initial drop of Genx, his C API for generating canonical XML.
Dave Malcolm has posted Conglomerate 0.7.12, an open source GUI XML editor for Linux written in C, and based on libxml2 and the GTk+ and Gnome libraries. This release adds Croatian and Japanese localizations, provides preliminary support for TEI Lite, adds a dialog for selecting which child element to insert when a DTD requires a choice, and makes numerous bug fixes. Conglomerate is published under the GPL.