Fantastic news for anyone with a place in their heart for the Atari 2600, Atari 7800 Pro System, ColecoVision, Magnavox Odyssey², or the Astrocade. The Internet Archive has posted playable emulations of all five of these old consoles on their site.
To play a game, pick a console, then pick a game (there are hundreds), then click the “Run” link on the right side of the page. Finally, read the instructions, then press the space bar to start.
Some of the games work well, others not so much. Clearly, this is a work in progress. If you run into problems with one browser, try switching to another.
Big wave of nostalgia for me.