Realms Online

Link- http://realmsonline.gamesamba.com/

Description:
Realms Online is a FREE-TO-PLAY (F2P) MMORPG focusing on player competition and Realm vs Realm combat.

• Realms Online offers 3 realms to
  choose from.
• 9 fully customizable player races.
• 6 classes with extensive customization.
• An ever-expanding number of quests.
• The ability to capture forts & castles.
• Expansive lands to explore.
• Support for Windows, Linux,
  and MacOSX.
• Premium items for enhanced gameplay.

Screen Shots: