Bukkit

ClearEntity

NoJoinMsg

A package of useful commands that can be used to mess with griefers, aid admins, have fun with, and other general purposes.

Basic Commands for all your minecrafty needs.

A player warnings and violations reporting system

CommandRedirector is permission-based lightweight plugin that allows you to view players commands

Stop players breaking itemframes throughout the world!

Simple /msg and /reply commands

OASIS

[V.I.K.I] Virtual Interactive Kinetic Intelligence

Auto set flags for WorldGuard regions!

Vanilla

One of the new age ban plugins

A plugin which bans a player's IP address.

WhitelistIP Reloaded

WordUp

Anti ForceOP

A plugin to protect areas with beacons

MachiTrap

Lets TNT explode much funnier. Can also be used as a anti-griefing-tool.