Bukkit

Permissions that change the players name color

ColorCodes gives the player a list of chat color codes.

Edit the Join and Leave-Message!

JoinAndLeaveMessage

BAMxmpp

Filter the chat with pre-configurated words that aren't allowed!

Please Don't, is a chat related plugin that blocks users from typing - or writing on a sign - words defined in the config.

You can easily set up join and quit messages

Join and Quit Message

Retrieve a detailed username history for any player.

Flight + PING>PONG

beeChat

Sticky notes are for anyone that has many things to do on a server or just wants to remember something.

A simple and lightweight chat manager that can restrict the usage of words

LobbyEssentials will turn any of your worlds into a lobby!

JoinQuitifier

easyBC: because Hello World is boring.

Check sites and more information with a single command.

Suggestions

Displays text when logging in to the server