Infinite mac is site for emulating old versions of Mac OS, going from Mac OS 1.0 to Mac OS X 10.4. It also comes prebundled with some games to play with (Some great examples being Doom, Specter, Glider and Another World.) And if that isn't enough for you, you could get even more games as it is connected to the software repository, the Macintosh Garden (Another good site.)
Want some quick, quirky, and fun entertainment right in the comfort of your browser? Well this might be the game for you! In this game you start off sitting with your pal Jeb with his big ol' bucket of popcorn. Unfortunately for you, the world will end, someway, somehow. It's basically an inevitability, so make the most of the situation by getting the most points via the different endings. Maybe then you could find out why the heck Jeb eats his popcorn that loudly.
https://media.textadventures.co.uk/games/PNMno4m7GUu6ZYjROpbLEg/TWETIT.html