Bukkit

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Mineload

A multi-channel chat-system. Can be used as an open-source, and more light-weight alternative to plugins like Herochat.

Show Grief Prevention claims on Dynmap maps

A plugin to manage manual point definitions for Minecraft Overviewer from within the Minecraft client.

Lava Challenge

Show a picture of your player's head in chat when they join! Very configurable.

GetInventory

Displays the scores from the pvp-stats-plugin in the Minecraft 1.5-Scoreboard.

This plugin logs various player activities such as chat, log-ins, log-outs, etc.

A plugin for Bukkit based Mnecraft servers that provides a per-world /rules command

A plugin that shows a player's in-game coordinates on command.

RoleplayTalkingVillagers

Set and Search for nearby Points of Interest!

Abacus

MOTDColor, change and colorize your MOTD in client server list.

Don't allow bad players to do bad things on your server!

Logs chat with a time stamp and records it into text files

PressureWarp - Teleports you to a certain location if you interact with a PressurePlate or a button

BarJoin