Bukkit

Vanish from the server while spying on other players

TNTAutoIgnite!

Polygonal-based Land Protection

ExtremeChatManager

JoinFirework

This plugin is used to prevent rank thirsty players!

The best (and only) noclip tool there is for Bukkit.

Server Motd Manager

BungeeNCPNotify

NoAboveNether

All the basic commands you could ever need

A powerful ant-cheat plugin that scans client side for hacks.

iChat+ is a simple plugin that: Bans, Mutes, Kicks all, Spawns all, and has a user info method!

A collection of useful administration and player commands and tools

A non-abandoned cron scheduler for minecraft bukkit!

The RePlug plugin-manager was created to have plugins not automatically load on server startup, or have them load in order.

A plugin for Bukkit Servers to log player chat and store it efficiently as well as view it from an easy to use command interface

Allows moderators/admins to easily display IP addresses for users

MobMastery allows you to configure the health and damage values for all the mobs

Allows users to maintain a friend list.