Bukkit

Control your chat.

Secure and configurable Ender Chests

Allows players to call for a remote admin

Control the enderman.

Keep track of your users and solve communication problems

MyHorse

Battling users that believe they can demand Operator status on the server.

Lag prevention made by The_Gang

An extensible, player-driven, chunk protection/ownership system.

Allows players to buy, sell and rent houses with signs

Regios

The official InventorySee plugin by TehCoderHD!

Mute Guests and Auto-Promote them

Track those griefers like a bird of prey!

This plugin adds a secure server setting so admins can maintenance their servers.

NoEntityGrief

SimplyPerms

Helps people stop spamming clicks!

JailWorker

AnvilControl