To try it yourself, go to infinitemac.org, a project run by software engineer Mihai Parparita. There, you can browse through all the major revisions of the Macintosh System Software (and, later, Mac OS). Some helpful text will guide you through the various operating systems’ major features if you’re not familiar with them.
Click Customize to pick which Mac you want to emulate. You can run up to 1996’s System 7.5.5 on the tiny black-and-white Macintosh SE. Or you can pretend you’re the king of the office with the powerful and colorful Macintosh II.
It comes with a bunch of apps and games preinstalled, giving you hours of entertainment. You can take a look at early versions of Photoshop, build delightfully ’90s-looking 3D scenes in KPT Bryce and revisit classic games like Another World, SimCity, Lemmings, Civilization and more.