Package: x11-utils

"x11-utils" package binaries on Debian:

/usr/bin/appres /usr/bin/editres /usr/bin/listres /usr/bin/luit /usr/bin/viewres /usr/bin/xdpyinfo /usr/bin/xdriinfo /usr/bin/xev /usr/bin/xfd /usr/bin/xfontsel /usr/bin/xkill /usr/bin/xlsatoms /usr/bin/xlsclients /usr/bin/xlsfonts /usr/bin/xmessage /usr/bin/xprop /usr/bin/xvinfo /usr/bin/xwininfo

You may install this package on Debian with apt-get install x11-utils