x11-xserver-utils 7.6+3 (i386 binary) in ubuntu quantal

 An X client is a program that interfaces with an X server (almost always via
 the X libraries), and thus with some input and output hardware like a
 graphics card, monitor, keyboard, and pointing device (such as a mouse).
 .
 This package provides a miscellaneous assortment of X Server utilities
 that ship with the X Window System, including:
  - iceauth, a tool for manipulating ICE protocol authorization records;
  - rgb;
  - sessreg, a simple program for managing utmp/wtmp entries;
  - xcmsdb, a device color characteristic utility for the X Color Management
    System;
  - xgamma, a tool for querying and setting a monitor's gamma correction;
  - xhost, a very dangerous program that you should never use;
  - xmodmap, a utility for modifying keymaps and pointer button mappings in X;
  - xrandr, a command-line interface to the RandR extension;
  - xrdb, a tool to manage the X server resource database;
  - xrefresh, a tool that forces a redraw of the X screen;
  - xset, a tool for setting miscellaneous X server parameters;
  - xsetmode and xsetpointer, tools for handling X Input devices;
  - xsetroot, a tool for tailoring the appearance of the root window;
  - xstdcmap, a utility to selectively define standard colormap properties;
  - xvidtune, a tool for customizing X server modelines for your monitor.