Question: FreeMIDI was a program made for the operating system developed by what company?

Context articles: Apple GS/OS
86-DOS
Windows RT
RC 4000 multiprogramming system
ISURU Linux
COS (operating system)
EROS (microkernel)
FreeMIDI
MS-DOS
Classic Mac OS

GS/OS is an operating system developed by Apple Computer for its Apple IIGS personal computer that uses the ProDOS filing system.
 It provides facilities for accessing the file system, controlling input/output devices, loading and running program files, and a system allowing programs to handle interrupts and signals.
 GS/OS was included as a component of Apple II System Software versions 4.0 through 6.0.1.
 GS/OS, unlike its predecessor, is written entirely in 16-bit code and was the first true 16-bit operating system for the Apple IIGS.
86-DOS is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit.
 Initially known as QDOS (Quick and Dirty Operating System) the name was changed to 86-DOS once SCP started licensing the operating system in 1980.
Windows RT is a mobile operating system developed by Microsoft.
 It is an edition of Windows 8.x built for the 32-bit ARM architecture (ARMv7).
 First unveiled in January 2011 at Consumer Electronics Show, the Windows 8 RT operating system was officially launched alongside Windows 8 on October 26, 2012, with the release of three Windows RT-based devices, including Microsoft's Surface tablet.
 Unlike Windows 8, Windows RT is only available as preloaded software on devices specifically designed for the operating system by original equipment manufacturers (OEMs).
The RC 4000 Multiprogramming System is a discontinued operating system developed for the RC 4000 minicomputer in 1969.
 It is historically notable for being the first attempt to break down an operating system into a group of interacting programs communicating via a message passing kernel.
 Although RC 4000 itself was not very successful it was nevertheless extremely influential, sparking the microkernel concept that dominated operating system research through the 1970s and 1980s.
 The system is also known as Monitor and, somewhat confusingly, simply RC 4000 depending on the reference.
 For clarity, this article will use the term Monitor.
ISURU Linux (Sinhalese: ) is an operating system developed by the Ministry of Education, Sri Lanka.
 ISURU Linux is customized for the use in Sri Lankan schools.
 ISURU Linux is based on Ubuntu Linux (Sinhalese: උබුන්ටු ලිනක්ස් ) operating system.
 Which is referred as "Operating system and Application software collection".
COS is a Linux kernel-based mobile operating system developed in China mainly targeting mobile devices, tablets and set top boxes.
 COS stand for China Operating system and is being developed by the Institute of Software at the Chinese Academy of Sciences (ISCAS) together with Shanghai Liantong Network Communications Technology to compete with foreign operating systems like iOS and Android.
 The operating system is based on Linux but the platform is closed source.
 Security and the risk of back doors in devices from foreign vendors are some of the main motivations for COS.
 Android had almost 90% of the smart phone market when COS was introduced and Apple most of the remaining market share.
 COS looks very similar to Android and has its own Application Portal much like Android Market and iOS App Store.
EROS ("The Extremely Reliable Operating System") is an operating system developed beginning in 1991 by The EROS Group, LLC., the Johns Hopkins University, and the University of Pennsylvania.
 Features include automatic data and process persistence, some preliminary real-time support, and capability-based security.
 EROS is purely a research operating system, and was never deployed in real world use.
 s of 2005 , development has stopped in favor of two successor systems, CapROS and Coyotos.
FreeMIDI was a popular and useful virtual studio management application by Mark of the Unicorn (MOTU) for the Classic Mac OS.
 It was used to mimic the physical setup of MIDI devices that are connected to the computer and provide applications and the Mac OS a way for referencing them.
MS-DOS ( ; acronym for "Microsoft Disk Operating System") is a discontinued operating system for x86-based personal computers mostly developed by Microsoft.
 Collectively, MS-DOS, its rebranding as IBM PC DOS, and some operating systems attempting to be compatible with MS-DOS, are sometimes referred to as "DOS" (which is also the generic acronym for disk operating system).
 MS-DOS was the main operating system for IBM PC compatible personal computers during the 1980s and the early 1990s, when it was gradually superseded by operating systems offering a graphical user interface (GUI), in various generations of the graphical Microsoft Windows operating system.
The "Classic" Mac OS is a graphical user interface-based operating system developed by Apple Inc. for its Macintosh family of personal computers from 1984 until 2001, the original member of the series of Macintosh operating systems.
 The Macintosh platform, which was introduced in the classic Mac OS, is credited with having popularized the early GUI concept.
 Mac OS was preinstalled on every Macintosh computer that was made during the era it was developed; it was also sold separately in retail stores.