Xsun
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Xsun is an X Window System (X11) implementation included with the Solaris Operating System, developed by Sun Microsystems. It replaced the older "Xnews" server, which supported the display of not only X11 applications, but also NeWS and SunView programs. Xsun removed support for these legacy environments, and added support for Display PostScript.
Xsun was first released as part of Solaris 2.3 in November 1993. It was originally based on X11 Release 5; the version included with Solaris 10 is based on X11R6.6.
Solaris 10 also includes the X.Org Server, the open-source software reference implementation of X, but only for x86 systems. Xsun remains the only supported X server for SPARC-based systems.