From an Internet Archive Blog Post by Jason Scott:
After offering in-browser emulation of console games, arcade machines, and a range of other home computers, the Internet Archive can now emulate the early models of the Apple Macintosh, the black-and-white, mouse driven computer that radically shifted the future of home computing in 1984.
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The first set of emulated Macintosh software is located in this collection. This is a curated presentation of applications, games, and operating systems from 1984-1989.
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The story of the creation of the operating system and the Macintosh itself are covered in many collections at the Archive, including this complete run of Macworld magazine and these deep-dive Macintosh books.