The Virtual OS Museum is a fantastic project that lets you run Mac OS, A/UX, NeXTSTEP, more
SMRTR summary
The Virtual OS Museum lets you explore over 1,700 pre-installed operating systems — from 1948 to today — spanning 600+ distinct OSes across 250+ platforms, including classic Mac OS, NeXTSTEP, and early Windows. Built over 20 years by developer Andrew Warkentin, it's available as a 121GB full download or a lighter 14GB version.
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