ftp.ntua.gr:/pub/X11
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X.org   : X.org foundation Source Archives
XForms  : XForms - a graphical user interface toolkit for X11
contrib : X11R6 contribution software
kde     : KDE project 
lesstif : LessTif library
mix     : MI/X, X-server for MS-Windows and MacOS
v	: V C++ GUI toolkit
wxwin	: wxWindows C/C++ GUI toolkit
xv      : xv - a graphics manipulation program for X11