Bukkit

Orebfuscator - Anti Xray

bPermissions

Prism

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

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

PlotSquared

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

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

Hide from your players! Invisibility for the distinguished gentleman.

Allows you to worldedit only in regions you own.

Residence

Player property protection using special block placement.

Continuation of the popular AntiCheat anti-cheating plugin.

Chunk protection plugin designed for ease-of-use.

CrazyLogin

PreciousStones

A Lightweight plugin, that let's the user enable and disable griefing for certain mobs.

EntityManager

Nerf those creepers

Seeing light in your darkest hour