Linux Standards Base - Free Standards Group - set of interface standards for compatibility among Linux distributions and enabling software applications to run on any compliant Linux system
UNIX Chronology - graphic representation of the major UNIX variants
Window Manager Specification Project - meant to unify the GNOME and KDE window manager hint conventions, part of the work of the X Desktop Group (XDG)
X Desktop Group (XDG) - formed in March 2000 to encourage cooperation among open source desktops for the X Window System, includes a list of related standards from the XDG and others
X Session Management Protocol (XSMP) - intended to provide a uniform mechanism for users to save and restore their sessions; the Session Management Library (SMlib) is a low level C language interface to XSMP