Archive.org has launched a new service called the Console Living Room. This service has a collection of vintage console games from the 70s and 80s.
These games first appeared on consoles like the Atari 2600, Atari 7800 ProSystem, ColecoVision, Magnavox Odyssey, and Astrocade.
Some of the games that are available include Donkey Kong, Frogger, and Dig Dug. The games are emulated using JSMESS, which allows you to run them without installing browser plugins.