On the back, the words “Hands-On Experience” and Mac OS 8 logo. At Apple’s Worldwide Developer Conference in June 1996, many of us got to experience the future of the Mac for the first time.

Some of the technology behind it had first appeared in Mac OS X Server 1.0 in March 1999. A hybrid of a Unix kernel, Unix-based application programming interfaces (APIs) and the existing Mac OS 8. ...

Slack developer Felix Rieseberg has transformed Mac OS 8 into an app you can install on your Mac or PC. The app even includes classic games like Duke Nukem 3D and apps like Photoshop 3.