The Internet Archive gathered hundreds games from the 1970s to the 1990s and makes them available to his audience through the JSMESS emulator which displays them interactively inletterweb browsing. The games contain quite big names such as Super Pac-Man, Q*bert Street Fighter II, Spiders, Sky Kid and the Three Stooges (a game from 1984).
Many of the games are fantastic and work fine in the browser environment, although you should get used to the new style of control, especially if you had played these games in real arcade machines.
You can see and try the games from here.