Mainframe operating system: z/OS
z/OS, a widely used mainframe operating system, is designed to offer a stable, secure, and continuously available environment for applications running on the mainframe.
Mainframe operating system: z/VM
a control program, z/Virtual Machine (z/VM) is a hypervisor because it runs other operating systems in the virtual machines it creates.
Mainframe operating system: z/VSE
z/Virtual Storage Extended (z/VSE) is popular with users of smaller mainframe computers. Some of these customers eventually migrate to z/OS when they grow beyond the capabilities of z/VSE.
Mainframe operating system: Linux for zSeries
Several (non-IBM) Linux distributions can be used on a mainframe.
Mainframe operating system: z/TPF
The z/Transaction Processing Facility (z/TPF) operating system is a special-purpose system that is used by companies with very high transaction volume, such as credit card companies and airline reservation systems.
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