For me its:
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Ultima Online
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Final Fantasy XI
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Ragnarok Online
UO was a game I just recently discovered and it's fantastic, best sandbox experience I've ever had in a game.
FFXI was another recent discovery. It took the formula from Everquest and made it better. The game is even less grindy today with the QOL changes.
RO was a big part of my teenage years. I love the look of the game, it reminds me of Final Fantasy Tactics. It's a great casual game to just pop into and grind out some levels or explore.
How is that? I know there's a small english speaking community that plays it but it's still never been localized right?
Correct. See my other reply for more general info on translation. I've pretty much been entirely solo since the game has been out for so long and recommend waiting for private servers to solve some pain points.