Bukkit

A plugin that allows applying global gamerule when a world is loaded and check per world gamerules.

Essentials Plugin

A plugin that lets admins chat privately together.

Changes time, weather, and difficulty easier.

Use a tiered system of trust to promote players.

MetaRestrict - Restrict enchantments, anvil and beacon use for specific item metadata

AdminCommandsBukkit

Check AutoSoup

Install Plugins with the Chat

Clears the chat upon an op or someone with the permission node to clear the chat.

Prevents players from joining your server unless there is staff online

HealSign

OPLock Reloaded Fixes from OPLock

FairPvp - Arena

LomeusInformation

PlayerInfo Gets a Player's common information.

ElectricStaff

Allows admins to send gifts to players though and easy-to-use interface.

Configure how many people of the same IP can join your server at the same time and in general

Make console more like in-game chat