Library with extensions for Xfce libexo is a library for Xfce that contains a bunch of additional widgets and a framework for editable toolbars (an improved version of the framework present in GNOME), light-weight session management support, functions to automatically synchronize object properties (based on GObject Binding Properties) and several miscellaneous utility and helper functions for application developers. While Xfce ships with quite a few libraries that are primarily targeted at desktop development, libexo is targeted at application development, with a focus on applications for Xfce.