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Apple gave versions up to 7.5.3 for free on its page. Not libre, but there's Executor (a fork of it) under Github which can run System 6/7 binaries.

• skissane 2y ago
  That’s not what we are talking about here. We are talking about the unreleased “Star Trek” project in which Apple ported System 7.1 to run on top of Novell DOS 7 (descendant of DR-DOS) - https://en.m.wikipedia.org/wiki/Star_Trek_project https://en.m.wikipedia.org/wiki/Star_Trek_project
• snvzz 2y ago
  We're talking about something else entirely. But even for "up to 7.5.3", it is just binaries; no source code.
  • skissane 2y ago
    > But even for "up to 7.5.3", it is just binaries; no source code. There is a leak of the System 7.1 source code floating around, although apparently it is missing some major components (such as the 68K emulator for PPC Macs)
    • musicale 2y ago
      Might need 7.1.2 for that.