Bukkit

Freeze the ground, players, mobs and moving things like arrows

NoESP

When a player dies, they get sent to a room for x seconds.

GCCassino

Simple TPA/Warp/Home plugin.

Retrieving Unique Player Profiles with historic usernames

Simple offline-mode authentication plugin

Have you ever wanted to protect your admins accounts from password thieves or their friends? This is your plugin!

Manage online/offline players with one command with a multi-paged control panel! Infinite Commands!

Lua for Bukkit.

A plugin that allows users to stack potions

Edit ServerMessages

Whitelist

ModPanel

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

PlayerJail

Own Portal is a plugin that fixes portal locations.

Turns Hardcore Deadly

SimpleInventoryBackup

Fake op that annoying player on your server!