Bukkit

WorldEdit is an in-game map editor for both creative and survival

WorldGuard

The most used authentication plugin for Spigot and CraftBukkit!

The premier long-range map editing tool for Minecraft SMP.

Guilds, war, land claiming, and user-controlled antigrief

Detect and fight the exploitation of various flaws/bugs in Minecraft!

Open anyone's inventory as a chest in real time!

Provides automated plots with protection (MultiWorld support)

LoginSecurity

a feature-rich world size limiting plugin, which can also generate or trim a world to your border

Bssentials GroupManager

Lockette v1.4 - Simple chest and door lock, no databases!

CoreProtect

The banning plugin that does everything. Properly.

A simple plugin to protect villagers

High performance authorization plugin

Grief Prevention

CombatLog aims to punish players who log out to escape combat.

Stops people from breaking farmland

Lightweight Protection for Chests, Furnaces, Dispensers, and more