xdg-desktop-menu - command line tool for (un)installing desktop menu items

xdg-desktop-icon - command line tool for (un)installing icons to the desktop

xdg-mime - command line tool for querying information about file type handling
and adding descriptions for new file types

xdg-icon-resource - command line tool for (un)installing icon resources

xdg-open - opens a file or URL in the user's preferred application

xdg-email - command line tool for sending mail using the user's preferred
e-mail composer

xdg-screensaver - command line tool for controlling the screensaver