Bukkit

With one command, you can see everyone elses commands!

SimpleBroadcaster

Change the "Unknow command" message

A powerful private chat system for interactive non-intrusive messaging

AdvencedReport

Discord bot for generating Minecraft player avatars

Simplified private message system

Make chat channels and custom Login/Logout Messages along with a better private message handler

Advanced StaffChannel

A simple chat filter plugin for your minecraft server!

Shorten those URLs!

Set custom join/leave messages for different players - or everyone!

Plugin de /report em Português

ClearChatPlus

AholaChat

The plugin allows to change the prefix of server and Broadcast Messages.

Smart Broadcaster

Tired of chat plugins that aren't up-to-date or won't fit your needs? Talk more with TalkMoar!

A really simple Auto spam banner.

ShortReport | Minecraft 1.11