Bukkit

A anti-greif server Control Plugin

AntiDrop [Stop players in Creative mode dropping items for other players]

A Simple Rank Plugin.

BlockIt - The Block Banning System

IM-Admin

Curse

This plugin will allow players to create locks for devices and containers.

Jail++ is a fully-featured Jail plugin for Bukkit, and it's the official successor of Jail, JailLikeHell, and SimpleJail.

Sync your WordPress Users to Bukkit!

FireFighter

Build towns!

Whitelist or Blacklist blocks per world.

Forces players to acknowledge the rules on your server.

A test plugin for Bionicrm.

a way for players to report on players.

Deadlyfe

Give a player a risk-free few minute free trial of your donator perks!

Modbot

SMPCommands

All-In-One Player Protection System