Apollo is an open-source developer test skeleton toolkit for Java Web Start/JNLP. It lets you turbo-charge Web Start apps without Web Start to speed up your compile/run/test/debug/goof-off cycle, avoiding the hassle of stuffing, signing, uploading, or downloading your jars every time you rearrange a comma in your source code.
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.
Gizmo Daemon is a program for controlling your computer based on events from input devices. It has built-in support for all Linux input devices, including keyboards with special keys, joysticks, remotes, dials, and more. It lets you control applications, launch programs, change the system volume, switch desktops, and directly control Amarok. It can visualize system events (such as Amarok sound output, CPU usage, etc.) on capable devices (keyboards with LEDs, Griffin PowerMate, etc.). It also features support for LIRC and RF based remote controls, allowing it to have per-application key mappings and configurable sensitivity settings.
Google Gadgets for Linux provides a platform for running Google Gadgets under Linux, catering to the unique needs of Linux users. It's compatible with the gadgets written for Google Desktop for Windows as well as the Universal Gadgets on iGoogle. There are two main components to the application: one is a common gadget library responsible for running and presenting a gadget, and the other is a host program that allows the user to choose gadgets and run them on the desktop. Currently it has hosts written for GTK+ and Qt, with the GTK+ host offering a sidebar similiar to that of Google Desktop for Windows.
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.