Or'sPvPController its a plugin thats allow you to control the PvP Mode in game without Closing the Server and Changing the Server Propties its can be Very Helpful For you and its Really Easy to Use !
SetPvPOn- Set's The PvP in the World On On SetPvPOff - Set's The PvP in the World On Off
Soon - Working on it
Version 0.1 - First Build Found 1 Bug - Fixed