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.
DDON is making massive strides right now with both private server feature implementation progress and the English translation has good coverage and improving quality. Check back in like a month or so and I bet it'll be a rock solid experience.
Frontier is basically ready at this point for most people to check out and play. I'd either play on Renewal or Mezelounge. Many of the Meze people are the same group behind DDON and Meze has a classic server for an older experience.
DQX uses a mix of manual and realtime translation and is in the worst state of the 3 (as it's on real servers). Once it gets private servers I imagine custom clients will start better solving translation problems.
Sweet. Thank for the info!