Bukkit

Chat is directed to only players standing on the same platform.

EchoTell

this adds much features to your hub world

Easy timed console commands

Allows you to make different lists than can be displayed to players

Holographic scrolling text next to nametags

chatterbox lets you use a Minecraft servers chat on a website.

A customisable broadcast plugin for your server!

Clears the chat from previous messages displayed.

a plugins that will allow players to talk with your server and you can define what it says

Quick Binder by DemoNIKman

BacketBowAPI

flexible, powerful, yet simple chat management

Plugin for spy on selected players

A simple plugin of custom enter and exit messages

NoCurse

Simple, lag-free, fake op plugin that you can use to troll your players!

A simple plugin allowing players to set their name to a solid color in a GUI!

A bridge between the in-game chat and a IRC server...

Text-Bubbles