Bukkit

JabBukkit Chat to XMPP Connector

WordBlocker is a plugin which certain words and commands from chat.

ControlledChat

Fake players can chat on their own!

send your message to everyone on your server./envoyez votre message à toute les personnes de votre serveur.

PlayerChecker

Nachrichten

Nickname Plugin - um dich umzubennen!

A simple plugin to censor chat.

Use color in chat and on signs

Aside

Broadcasts a Welcome message to all players online for new players.

vSignEditor - Sign Editor

This plugin allow you to mute players and mute everyone but ops.

Use a Twitter Feed as your announcements!

WelcomeMe is a very easy and lightweight plugin to manage your server messages!

CustomSayCommand

Fake join and leave messages!

A plugin that allows you to have custom messages broadcasted on join

DChatCleaner - Advanced Chat Cleaner