Luxor is an open-source XML User Interface Language (XUL) toolkit in Java that lets you build UIs using XML and also includes an ultra light-weight, multi-threaded Web server, a portal engine, and a template engine. It is also Web Start-ready, as everything fits in a jar and requires no loose files.
BloGTK is a Weblog editor that lets you write, edit, and manage Weblog entries on multiple blog accounts from one convenient interface. BloGTK features a powerful editor with syntax highlighting and integrated spellchecking, as well as a WebKit-powered preview system. BloGTK supports Weblogs running on WordPress, Blogger, Movable Type, and more.