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!

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

Provides automated plots with protection (MultiWorld support)

LoginSecurity

The banning plugin that does everything. Properly.

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

Bssentials GroupManager

Grief Prevention

CoreProtect

Advanced /vanish plugin which makes other players think that you're not on the server

High performance authorization plugin

Lightweight Protection for Chests, Furnaces, Dispensers, and more

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

Hide and Custom your Plugins and other Commands!