This site allows you to experience what classic Macintosh operating systems were like. You can launch most of those versions in your browser. More applications and games can be installed as well. At the very least, you can see how the operating system evolved over time.
Been playing around with old versions of win 9x this past month, and came across this find. Now growing up I only had windows boxes, but this is a fun find for any who wonders what Mac looked like in the past.
Came across this when I was trying to find a way to get Netscape Navigator.