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Yes, IBM released OS2, I don't know if it still exists as a commercially viable product. Intel released iRMX which was an incredible "real time" operating system that was great for process control, but again I don't know if it's still available. QNX is an excellent operating system for distributed processing and is currently available. I'm sure there are may other operating systems that specialize in their own niche.
There are many operating systems beside the ones mentioned. Many are no longer marketed but may still be in use as the hardware is still working and doing its job.
Digital Equipment Corporation (now part of HP) used to sell the PDP-8 and PDP 12 (they ran tss-8, ps/8 and os/8), PDP-10 and PDP-20 (ran TOPS-10 and TOPS-20), PDP-11 (ran DOS-11, RT-11, RSTS). I believe the PDP-11 is still being used to manage some nuclear plants and there is much discussion as to whether they should leave it or switch to a modern system. They are also still selling (by another company) OpenVMS which used to run on VAX hardware, then ALPHA hardware and is now available on an Intel Itanium. The OpenVMS system is one of the first systems to actually be part of a network, and part of the internet when it was called arpanet. It also has the reputation of being one of the most secure systems around and the longest up time between software crashes.
IBM has their mainframe that first came out in the 1960's running a system called OS/360, then OS/370 and now called system Z. It is a popular secure workhorse at large banking and financial institutions. The mainframe also runs a version of linux. IBM also has the power systems which runs AIX (a version of the real unix), IBM i, and also a version of linux.
There are many other companies that are no longer around and their software systems have been abandoned or absorbed and incorporated into modern systems.
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