The X.Org project

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X11 refers to the X.Org implementation of the X Window System. It's also simply known as X. All X11 packages are free software, most under the X11 license. It runs on most free operating systems, including on the GNU system and its GNU/Linux variants.

Core X11 runtime


  • iceauth - ICE authority file utility
  • rgb - X colorname -> RGB mapping database
  • sessreg - Register X sessions in system utmp/utmpx databases
  • setxkbmap - set the keyboard using the X Keyboard Extension
  • smproxy - Session Manager Proxy
  • xauth - X authority file utility
  • xdpyinfo - display information utility for X
  • xev - print contents of X events
  • xhost - server access control program for X
  • xinit - X Window System initializer (includes startx)
  • xkbcomp - compile XKB keyboard description
  • xkill - kill a client by its X resource
  • xlsatoms - list interned atoms defined on server
  • xlsclients - list client applications running on a display
  • xlsfonts - list X fonts available on X server
  • xmodmap - utility for modifying keymaps and button mappings
  • xprop - property displayer for X
  • xrandr - primitive command line interface to RandR extension
  • xrdb - X server resource database utility
  • xrefresh - refresh all or part of an X screen
  • xset - user preference utility for X
  • xsetmode - set the mode for an X Input device
  • xsetpointer - set an X Input device as the main pointer
  • xsm - X Session Manager
  • xvinfo - Print out X-Video extension adaptor information
  • xwininfo - window information utility for X


  • bitmaps - standard set of X bitmaps
  • cursors - standard set of X cursors
  • xkeyboard-config - database of keyboard configuration data


  • FS - X Font Service client library
  • ICE - Inter-Client Exchange library
  • SM - Session Management library
  • X11 - X11 Client library
  • Xau - X Authorization routines
  • Xcomposite - Composite extension
  • Xdamage - Damage extension
  • Xdmcp - X Display Manager Control Protocol routines
  • Xext - common X Extensions library
  • Xfixes - X-Fixes extension
  • Xfont - X font handling library for server & utilities
  • Xfontcache - X-TrueType font cache extension client library
  • Xft - Client side font rendering library
  • Xi - X Input Extension library
  • Xinerama - Xinerama protocol library
  • Xmu - X miscellaneous utility routines
  • Xpm - XPM format pixmap library
  • Xrandr - Xrandr extension library
  • Xrender - RENDER extension library
  • Xv - Xvideo extension library
  • Xxf86misc - XFree86-MISC extension library
  • Xxf86vm - XFree86-VidMode extension library
  • fontenc - font encoding library
  • lbxutil - LBX utility routines
  • xkbfile - XKB file handling routines


  • xorg - X servers (including Xorg, Xprt, Xvfb, Xnest, & Xdmx)

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