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.
Core X11 runtime
app/iceauth - ICE authority file utility app/rgb - X colorname -> RGB mapping database app/sessreg - Register X sessions in system utmp/utmpx databases app/setxkbmap - set the keyboard using the X Keyboard Extension app/smproxy - Session Manager Proxy app/xauth - X authority file utility app/xdpyinfo - display information utility for X app/xev - print contents of X events app/xhost - server access control program for X app/xinit - X Window System initializer (includes startx) app/xkbcomp - compile XKB keyboard description app/xkill - kill a client by its X resource app/xlsatoms - list interned atoms defined on server app/xlsclients - list client applications running on a display app/xlsfonts - list X fonts available on X server app/xmodmap - utility for modifying keymaps and button mappings app/xprop - property displayer for X app/xrandr - primitive command line interface to RandR extension app/xrdb - X server resource database utility app/xrefresh - refresh all or part of an X screen app/xset - user preference utility for X app/xsetmode - set the mode for an X Input device app/xsetpointer - set an X Input device as the main pointer app/xsm - X Session Manager app/xvinfo - Print out X-Video extension adaptor information app/xwininfo - window information utility for X data/bitmaps - standard set of X bitmaps data/cursors - standard set of X cursors lib/FS - X Font Service client library lib/ICE - Inter-Client Exchange library lib/SM - Session Management library lib/X11 - X11 Client library lib/Xau - X Authorization routines lib/Xcomposite - Composite extension lib/Xdamage - Damage extension lib/Xdmcp - X Display Manager Control Protocol routines lib/Xext - common X Extensions library lib/Xfixes - X-Fixes extension lib/Xfont - X font handling library for server & utilities lib/Xfontcache - X-TrueType font cache extension client library lib/Xft - Client side font rendering library lib/Xi - X Input Extension library lib/Xinerama - Xinerama protocol library lib/Xmu - X miscellaneous utility routines lib/Xpm - XPM format pixmap library lib/Xrandr - Xrandr extension library lib/Xrender - RENDER extension library lib/Xv - Xvideo extension library lib/Xxf86misc - XFree86-MISC extension library lib/Xxf86vm - XFree86-VidMode extension library lib/fontenc - font encoding library lib/lbxutil - LBX utility routines lib/xkbfile - XKB file handling routines xserver/xorg - X servers (including Xorg, Xprt, Xvfb, Xnest, & Xdmx)
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