Viki from kdenonbeta is a small utility that shows a keyboard using the currently configured keyboard layout / language. To make it useful, you should it combine it with the "sticky keys"-feature in the KDE Control center (see devices / keyboard), and maybe with kmousetool from the KDE accessibility package. If you wish to try this out, please ask for further information on kde-accessibility@mail.kde.org

Another option is gok from the GAP (GNOME Accessibility Project), which much bigger and is very feature rich. It allows you to define your own keyboard layouts and works with any X application. For applications that support ATK another great features is mpossible: The integration of the applications' user interface into the on-screen keyboard. Once the bridge is completed and KDE has been extended to fully use Qt's Accessibility Framework, perfect interoperability will be possible here, but that still needs to be done.

In any case, if you have further questions, please join out mailing list at https://mail.kde.org/mailman/listinfo/kde-accessibility/

Olaf Jan Schmidt
(KDE Accessibility Project)