The Internet Archive, one of (the?) most important resources on the internet is in the midst of a huge upgrade to its free arcade;
https://archive.org/details/internetarcade
there are now close to 3000 arcade machines to play. While many of the new machines are not in English, there are plenty of classics as well as should’ve-been-classics.
(Looking at you, Ninja Baseball Batman! )
https://archive.org/details/internetarcadet