Bukkit

Seperate players who say butter/budder

UltimateChat

JEJoin - Bukkit plugin that allows you to change the message on the join or quit of the server.

Anti Command plugin

The easy way to chat with your staff members!

ClearTheChat

a plugins that will allow players to talk with your server and you can define what it says

Trick players into thinking they are op!

A plugin that allows users to chat locally and globally.

Create command aliases.

Minecraft Chat Filter for Bukkit 1.10.2

CleanMyChat is a simple plugin that allows players to clear the chat on their end only!

BetterMessages

ReplaceRegex

FakeMessage is as the name suggest, a plugin that sends a fake message to all players (./fake join (fake join message))

JoinOrQuit

IClear

Use texting to communicate with your server. Also allows for social network connection.

ServerJoinMessage

Hate configuring broadcasting plugins? This plugin has 11+ premade broadcasts!