Xfce4-notifyd is a notification service for the Xfce Desktop that implements most of the “server-side” portion of the Freedesktop desktop notifications specification. Applications that wish to pop up a notification bubble in
a standard way can implicitly make use of xfce4-notifyd to do so by sending standard messages over D-Bus using the
org.freedesktop.Notifications interface. Read the specification here.
Which parts of which specifications are implemented and supported.
Configuring the appearance of notification bubbles.
Options for power-users.
How to create a notification theme.
Where and how to report bugs.