Bukkit

easyBC: because Hello World is boring.

Disguise

Little Chat is a light weight chat plugin for Minecraft v1.7.2 and up!

PerWorldChat+

Lets Staff talk to other staff in one chat channel. Same thing for donors too!

TouchNotices

A plugin that allows users to chat locally and globally.

CiwnyNoCurse ENGLISH

SimpleChatrooms

Use @a, @p, @r without any command block !

SimpleGlobalMute

Change commands to fit your needs, on a personal level! Individual users can set shortcuts for commands!

IpsBlock

This Plugin can clear your chat with some extra features !

Color for the Chat

cloned the fantastic AFK plugin and added one small feature.

ZirconEssentials

Inform your players when someone is streaming or recording.

Re-SoupEx

If a player is annoying you can do the command /warn <player> <reason> to give that Player a warning.