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.
The only mmo I've ever played was Toontown
Any good? Never tried it but it looks cute.
All I remember is that I had fun, but I was like 12. I've been meaning to check out Toontown rewritten
there's also Corporate Clash