Windows 8.1 and OS X Mavericks may be the two foremost operating systems available at desktop level, but they weren't always as slick, intuitive and feature-rich as they appear in the present day. Over the past 30+ years, the respective OSes for PC and Mac have seen many changes, and although we certainly couldn't go through a day using the old software from the eighties, nostalgic heads will probably want to check out an interesting Web-based emulator that runs both Windows 1.01 And Mac OS System 7. It's certainly a bit of a throwback, and even if you're not perhaps old enough to remember either of these vintage release, it's definitely worth taking a peek.
