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HP-UX (Hewlett-Packard UniX) is Hewlett-Packard's proprietary implementation of the Unix operating system, based on UNIX System V (initially System III) and first released in 1984. Recent versions support the HP 9000 series of computer systems, based on the PA-RISC processor architecture, and HP Integrity systems, based on Intel's Itanium architecture.

MorphOS is an Amiga compatible computer operating system. It is a mixed proprietary and open source OS produced for the Pegasos PowerPC processor based computer, PowerUP accelerator equipped Amiga computers, and a series of Freescale development boards that use the Genesi Firmware, including the EFIKA and mobileGT. Since MorphOS 2.4 Apple, Inc. Mac Mini G4 is supported as well, with the release of MorphOS 2.5 and MorphOS 2.6 the eMac and PowerMac G4 models are respectively supported. The core, based on the Quark microkernel, is proprietary, although several libraries and other parts are open source, such as Ambient desktop.

Windows Millennium Edition, or Windows Me (pronounced as an abbreviation, "windows em-e"), is a graphical operating system released on September 14, 2000 by Microsoft, and was the last operating system released in the Windows 9x series. Support for Windows Me ended on July 11, 2006.

SUSE Linux ( /ˈsuːsə/;[1] German: [ˈzuːzə]) is a computer operating system. It is built on top of the open source Linux kernel and is distributed with system and application software from other open source projects. SUSE Linux is of German origin and mainly developed in Europe. The first version appeared in early 1994, making SUSE the oldest existing commercial distribution. It is known for its YaST configuration tool.

Debian (/ˈdɛbiən/) is a computer operating system composed of software packages released as free and open source software under primarily the GNU General Public License along with other free software licenses. With its inclusion of the GNU OS tools and Linux kernel, Debian GNU/Linux is a popular and influential Linux distribution. It is distributed with access to repositories containing thousands of software packages ready for installation and use. Debian is known for relatively strict adherence to the Unix and free software philosophies as well as using collaborative software development and testing processes. Debian can be used as a desktop as well as server operating system. It focuses on stability and security and is used as a base for many other distributions.

Red Hat Linux, assembled by the company Red Hat, was a popular Linux based operating system until its discontinuation in 2004.

Windows 98 (codenamed Memphis) is a graphical operating system by Microsoft. It is the second major release in the Windows 9x line of operating systems. It was released to manufacturing on 15 May 1998 and to retail on 25 June 1998. Windows 98 is the successor to Windows 95. Like its predecessor, it is a hybrid 16-bit/32-bit[2] monolithic product with an MS-DOS based boot loader.[3] Windows 98 was succeeded by Windows 98 Second Edition on 5 May 1999, then by Windows Me (Millennium Edition) on 14 September 2000. Microsoft support for Windows 98 ended on 11 July 2006.

Mac OS 9 is the final major release of Apple's "Classic" Mac OS. Introduced on October 23, 1999, Apple positioned it as "The Best Internet Operating System Ever,"[1] highlighting Sherlock 2's Internet search capabilities, integration with Apple's free online services known as iTools and improved Open Transport networking.

Juniper Junos is the software or the network operating system used in Juniper Networks hardware systems. It's an operating system that is used in Juniper's routing, switching and security devices. Juniper offers the Software Development Kit (SDK) to partners and customers to allow additional customization. The biggest competitor of Junos is Cisco Systems's IOS.

Palm OS (also known as Garnet OS) is a mobile operating system initially developed by Palm, Inc., for personal digital assistants (PDAs) in 1996. Palm OS is designed for ease of use with a touchscreen-based graphical user interface. It is provided with a suite of basic applications for personal information management. Later versions of the OS have been extended to support smartphones. Several other licensees have manufactured devices powered by Palm OS.