These are in no specific order, and everything is from memory... which is a loooong time back. This is likely incomplete.

Note that I played them solo (usually), so there's no "completion" since I never completed any of them. I also took the "Free" in "Free2Play" seriously.

• Flyff
  
  • This was a rather old version, before the skill-system update. I actually left due to how the update was done, and blacklisted the publisher.
    
  • I got rather far into the game compared to other MMORPGs, as one of my characters was a Psykeeper which has a rooting ability -- this was particularly useful to solo bosses, but also allowed careful progression into higher level areas.
  
  
• Lord of the Rings
  
• Cabal Online
  
• Dream of Mirror Online
  
• Perfect World
  
  
• Requiem[en.wikipedia.org]
  
  • apparently, I was playing the older version
  
  
• Last Chaos
  
• Trickster