PvPFreezePlugin
About
A Minecraft plugin that adds PvP toggle and player freeze management commands. /pvp on enables PvP globally, /pvp off disables all player-vs-player damage. /freeze all freezes all online players plus new joiners, /freeze <player> freezes a specific player, /freeze players freezes all non-operator players. /unfreeze counterparts reverse these effects. Frozen players cannot move, interact, break blocks, or place blocks.