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Intel Unix System V was a rather uncommon Unix variant developed and distributed by Intel, for IBM PC compatible hardware. It was considered "plain vanilla" compared to other distributions, adding little beyond AT&T's codebase.
The Xenix Development System is a set of compiler and code tools for the Xenix operating system.
Xerox Globalview is a desktop environment and office suite originally developed for the Xerox Star. It was developed in the MESA programming language on the Xerox Star, and ported to Sun Solaris, OS/2, and Windows 3.1 (The OS/2 version requires a MESA emulator card).