Bukkit

SayWhat saves typing time. Store abbreviations for your commonly used messages.

FreezeAndMute

EzBroadcast

Smiler

PsuedoMe - Make other players chat things!

Control other player's chat messages, make them run commands, or fake a person joining and/or leaving the game!

NoPluginPlus

Place colors in your name using simple permissions

WhiteMessage 2.0

LineXChat is a chat plugin that allows simple usage for users and powerful administration for admins.

JPM

FakeEvent a troll plugin that allows you to create fake join and leave events!

Small additions to your SMP. Such as invis item frames and custom events.

A simple plugin for a few fundamental features...

ManagerChat

Display all the server links with a custom command!

ChatBot

A plugin that changes the join and leave massages

MumbleChat is a chat manager plugin aimed at controlling chat flow for servers with a fast chat flow.

Change player display name in config.yml