Bukkit

VoteClick

PlayerCMD

Change the text and color of advancement messages

Quickly and easily manage rank tags and player prefixes without the hassle

API Plugin for realtime item, chat and custom translations

InstantChatClear

CustomAlert/MOTD/Broadcast

Create custom Tags on top of your head!

A easy to use chat formatting plugin!

Display custom help broadcasts at an interval

FaceChat

Modify chat messages using regular expressions.

Lightweight Staff Chat Plugin

Customize everything from death messages to join/quit messages!

Allows players with a set permission to access an exclusive chat.

HCommonEssentials is a bukkit plugin that has all of the commands you need

TheGreatPlugin

RandomTip is an announcer, that can announces tips with or without a random number (for fun).

A simple plugin that loggs the spawning of creatures

EasyTimedMessages allows for timed broadcasts (set in config) to be made easily.