X11R7.7-RC1 Manual Pages: Section 7: Miscellaneous
Documentation for the X Window System Version 11 Release 7.7 - Release Candidate 1 (X11R7.7-RC1)
XConsortium − X Consortium information
XStandards − X Window System Standards and Specifications
X - a portable, network-transparent window system
xkeyboard-config − XKB data description files
XOrgFoundation - X.Org Foundation information
XProjectTeam - X.Org Group information
Xsecurity - X display access control