Bukkit

ctOS Connecting Our World To Hackers

It gives some information about players

PlayerStatsChat

NoTalk

CommandHelp

Simple plugin for reporting cheaters.

Send fake (+colored) messages to players!

vFreezePlayers (to freeze a player)

A basic /helpop plugin

Be who you want to be!

NavoHub

Get the attention of your fellow players with Chat@!

SimpleCalc - A calculator for servers!

A catastrophe of Cats!

ScF-Colors

Ever wanted special characters in your server?

A join / leave plugin that sends a different join / leave message when someone joins or leaves the server.

A custom plugin to allow players to "poke" or notify each other!

Suggestions

XyploScoreboardStaff