The 2 plugins BattleArena and BattleTracker have been added to the server. BattleTracker tracks your PvP and PvE information, and will display it on leaderboards at spawn. You can Right click the signs to find your personal information.
BattleArena adds a plethora of Arena options. All players have permission to use it, and it's available in all worlds. Check out the Wiki for it: http://battleplugins.com/w/index.php/BattleArena (http://battleplugins.com/w/index.php/BattleArena)
Reply if you want any help or info :)