Bukkit

The all in one command plugin aimed for controllability.

Custom Welcome messages

UltraHelpop

Notifies the player if someone mentions his/her name.

Youtube plugin for your Youtubers and Streamers to announce it to your players!

Basic informational commands that give player access to simple questions about server information! (Voting, Skype, YouTube .etc)

Adds the /pingtest command useful for testing server lag.

BuildABot-BASIC

Mute everyone! Period.

Stops Join/Leave and death messages to show up! Perfect for HUB/LOBBY servers!

Advanced Broadcaster

Customizable kill/death messages

TeamChat

Plugin

Social: A plugin which allows players to display their social networking IDs/names

Plugin that can broadcast messages, customizable prefix and suffix

Configurable death messages.

Blocks join and quit messages

BulletinBoard

SAnunciar