KBDD stands for keyboard daemon. It is a simple keyboard layout
switching program, which is designed to run in an X11 session and
remember keyboard layouts on a per-window basis. That can be very
handy for a user of a non-US keyboard who does not want to jump
through layouts back and forth while typing in terminals (mostly in
latin) and some kind of chat (in native language). Another useful
thing about KBDD is its D-Bus notification support — it can emit
signals on layout change, thus, making it possible to create layout
indicator widgets in such window managers as awesome, for example.
Users of popular desktop environments such as GNOME or KDE most
likely do not need this package, as a similar functionality should
be already available within their environment. This package may be
of interest, however, for the users of tiling or dynamic window
managers such as dwm or awesome.