Bukkit

ColoredGroups

When Someone Mentions You It Will Notify You!

This plugin is an events plugin, it is more created for lobbies but you can use it for the things you want

New guilds plugin! NovaGuilds!

VIP+ Chat (Complete Re-code)

FunAdmin

Easily Manage Chat With This Plugin

A simple plugin that adds commands such as /kiss. The intention is to add a way to express your feelings towards other players.

Ever wanted Hashtags(#) and At Signs(@) in chat? Both metered to see how many times that particular sign has been used!

See a player's commands, or all players commands in the server !

This is an GUI where you can manage important World and Server options from basic Vanilla. And adds some commands like fly invsee and similar. All commands have own permissions.

Per user, per world highly configurable compass mechanics.

Allows players to have nicknames.

edit all messages of your server

Spam Detection System with AutoBan/AutoKick

SpeechBubbles

Allows server Owners to disable commands per-person, Per-Region, and in Groups; EVEN OPS, and Players with '*' permission!!

ChatTools

Convert worlds into instanced dungeons.

Logs chat and commands