x86 x86 processor socket XA Xaw Xbase xbeeb xbm XC Xcoral xdbx XDL XDR XDS 530 XDS 940 xDSL
| Xemacs XENIX Xeon XEROX Corporation Xerox Data Systems Model 530 Xerox Data Systems Model 940 XEROX Network Services Xerox Network System XEROX PARC Xerox Star XFree86 Project, Inc. Xfun XGA XGA-2 XHTML
| Xi XIE Xilinx Netlist Format Xilinx, Inc. Xlib xlisp xls XML XML Template Pages XML User-Interface Language XMM XMODEM XMODEM-1K xmosaic XMS
|