Bukkit

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

WorldGuard

Grief Prevention

The most used authentication plugin for Spigot and CraftBukkit!

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

Stops people from breaking farmland

LoginSecurity

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

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

CoreProtect

FastAsyncWorldEdit

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

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

Inexpensively protects your ores from cheaters.

Claim land of any shape, not just within a chunk

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

Nerf those creepers

PlotSquared

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

Backup and restore your server with ease. [aupports FTP]