I think by now everyone knows The Internet Archive quiet well. Acting as a custodian for once forgotten documents, sites and software from the earliest days of computing, the site keeps growing day by day. Now their collection of working arcade machines that run in the browser, has gotten a new upgrade in its 4th year. Advancements by both the MAME emulator team and the Emscripten conversion process allowed the team to go through many more potential arcade machines and add them to the site.
The majority of these newly-available games date to the 1990s and early 2000s, as arcade machines both became significantly more complicated and graphically rich, while also suffering from the video game consoles that would eventually come to dominate gaming.
Now a word of warning, a fairly powerful machine and up to date browser will be required to run these games. In general, pressing the 5 key will insert coins, 1 and 2 will start 1 or 2 player games, and the arrow and spacebar keys will control the games themselves.
Let the games begin!
Website: The Internet Archive