Slack developer Felix Rieseberg has transformed Mac OS 8 into an app you can install on your Mac or PC.
The macintosh.js app is written in JavaScript, and it uses a virtual machine to emulate a Macintosh Quadra 900 with the Motorola CPU Apple used before its transition to IBM’s PowerPC chips. Rieseberg has managed to get classic games like Duke Nukem 3D, Civilization II, Dungeons & Dragons, Namely, Oregon Trail, Alley 19 Bowling, and Damage Incorporated running. There’s even apps and trials preinstalled, including Photoshop 3, Premiere 4, Illustrator 5.5, StuffIt Expander, and Apple’s Web Page Construction Kit.
More info: https://github.com/felixrieseberg/macintosh.js
