Linux: Application launcher GNOME Do has a "theme" called Docky that we rated as an intelligent Linux interface. Now Docky is available as its own application, bringing many of its best features over and setting the stage for many more.
Docky was a clever app for GNOME Do to integrate with, offering application launching and an OS X–like dock from a single screen space. It was, however, not quite a perfect pairing, as it tied together a lot of of processes, and was somewhat inconsistent and slightly buggy in how it operated. As its own separate software project and app, it's free to develop, and even in the first alpha of 2.0 available, it's worth checking out as a desktop power tool.
The "docklets" and plug-ins that were present in GNOME Do, like battery, CPU and weather monitors are still around, while smart items like a Gmail notifier and recent documents icon have been added. The interface is also more functional, allowing for dragging-and-dropping files from the desktop to dock folder icons, and opening files in certain apps by dragging files on them. You can run multiple docks, change each of their themes, icon sizes and zoom levels, and run Docky in "Panel Mode", taking up the whole of a window edge.
Docky is a free download for Linux systems only; an easy-install Ubuntu repository and source code are available at the link.