Xerox
Xerox Alto
Xerox PARC
Xetra
Xfce
XForms
XFree86
XFS
Xgl
XHTML
XHTML Friends Network
XI
XII
XIII
XImage
Ximian
Xinerama
Xiph.Org
XIV
XIX
X Japan
XL
Xlib
XLIFF
XLink
XM-8
Xmas Story
Xming
XML
XMLHttpRequest
XML-RPC
XML Schema
XML-документ правильного формата
XML-канал
XMMS
X-Moto
XMPlay
X Neural Switcher
XnGine
XnView
XO-1
XOberon
X.Org
X.Org Foundation
XOTcl
xp.
XPath
XPInstall
X-Plane
XPointer
русский