GriefPrevention
The official self-service anti-griefing Bukkit plugin for Minecraft
...It helps prevent damage, theft, unwanted building, and other griefing behavior before server staff have to respond manually. Players can protect their own builds with minimal administrator involvement, which makes it useful for public survival servers with many users. The project targets current Spigot, Paper, and Purpur servers, while older versions remain available separately for legacy Minecraft environments. It also has an addon ecosystem for extending protection behavior beyond the core plugin. GriefPrevention is best suited for server owners who want practical build protection, fewer moderation emergencies, and a player-friendly claiming system.