Ubuntu (2004) 11 Linux

Ubuntu is a distribution based on Debian Linux that includes many common application programs. For a time it was considered relatively easy to use and set up compared to other distributions.

• 4.10

UnixWare (1992) 2 Unix

Unixware is a variant of Unix from Novell that incorporated its Netware features. It was later absorbed and merged with SCO Unix, which took on the Unixware name.

• 2.x

Virtual PC (1996) 32 Virtualization Windows OS2 MacOS

Virtual PC started off originally as an x86 emulator for PowerPC Macintosh to run MS-DOS and Microsoft Windows. Connectix, the company that made it, was purchased by Microsoft. Virtual PC was then retooled into a virtualization tool for x86 systems. Microsoft discontinued Virtual PC in favor of a server-oriented virtualization product called Hyper-V.

• 4.x

VisPro/C++ (1994) 0 OS2

VisPro/C++, from HockWare is a IDE and rapid application development tool for OS/2. Supports several of the more popular C++ compilers including VisualAge and MetaWare.

• 3.x

WordPerfect (1983) 150 Word Processor Unix Linux

During the late 1980's, WordPerfect was THE standard word processor for DOS based PCs in big business. Under DOS, it competed mostly against Wordstar. WordPerfect for Windows enjoyed some success in the early Windows environments, but was quickly displaced by Microsoft Word for Windows. Later Windows versions were part of Borland Office/Novell PerfectOffice/Corel Office/Corel WordPerfect Office.

• 6.0 (Unix)
• 8.x (Unix)

Worldgroup Server (1995) 1 Server Unix

Worldgroup Server is a bulletin board system server.

• 1.01

Xandros Linux (2003) 6 Linux

Xandros Linux is a proprietary variant of Linux that sprung up out of the proprietary Corel Linux after they sold off their Linux business.

• 2.x
• 3.x

Xenix (1984) 92 Unix

Xenix was the variant of UNIX originally published by Microsoft, later sold to SCO. It added a variety of technical enhancements over System V Unix, including a menu-driven business shell. It was ported to many different platforms from a PDP-11 including the Altos 8600 (First x86 port), IBM PC, Intel System 86, TRS-80 Model 16, SCP Gazelle II, and Apple Lisa. The Xenix Software Development System, Microsoft Multiplan 2.x and Microsoft Multiplan 3.x, Microsoft Word 3.0 and Microsoft Word 5.x, and FoxBase Plus 1.00

• OpenServer 5.x
• UnixWare 7.x