Here we have Lipstick which is a QML toolkit “of sorts” for making compelling user interfaces for devices easily. It is written in Qt and uses QML for the User Interface which is written by Thomas Swindell and the back End by Robin Burchell. We can be seen is a Launcher and switcher screens and this is very much a work in progress. The current UI can run on Lenovo IdeaPad and also the Nokia N900.
It runs on top of MeeGo CE / Mer which is a lightweight, highly portable Linux distribution (with no UI) for vendors and software hackers to make products on top of.
Update: Here is a video of the UI running on a Vega Tablet