Oldest software system in continuous use

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Ibm mainframe mainframe-emulator Emulator

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  • hyperion

    The SDL Hercules 4.x Hyperion version of the System/370, ESA/390, and z/Architecture Emulator (by SDL-Hercules-390)

    • There are two real emulators: Hercules (https://github.com/SDL-Hercules-390/hyperion) and IBM's ZD&T (https://www.ibm.com/docs/en/zdt/12.0.0?topic=personal-edition). Unfortunately Hercules can not be generally used to run commercial OS and software, and ZD&T is not licensed to run production workloads.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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