Bukkit

A plugin that lets you print anything into the chat

RealMotd

Simple Suffix

Hit a sign, run a hidden command!

Advanced AntiSpam

Define your own join and quit messages with colors, groups and chatnames. (Prefix and Suffix, too!)

Let players advertise their shops and locations to others

PvPLevels Reloaded

An efficient plugin to check the time spent by players in the game.

BSwear (Better Antiswear) is a very powerful antiswear plugin (with lots of words preblocked in the config)

SignInColors

MessageFilter

Ever want to turn :) into a real smiley? Well now you can

This is an easy staffchat plugin to communicate with other staffs, helpers, admins and mods!!

Lots of cool chat managing things!

LootCrate Votifier Listener

MyIRC

Show a picture of your player's head in chat when they join! Very configurable.

ECBroadcaster

A guard plugin for prison servers!