Bukkit

Hide your join and quit messages from other users.

MCWebi

Make custom gates, doors, entrances

SimpleSpawners

Minecraft plugin to help moderate a server

SuggestionBox is a plugin for obtaining suggestions, comments, questions, and requests for your Bukkit server.

Plots Generator - PlotGen

Displays your name in the server MOTD when you ping the server.

/help brings up a gui that is changeable

DropStopper

Colored Item Gift

A plugin allows you to give items / commands to all the players which supports generating random number.

SigniPak will be a all in one plugin that contains many essential and significant(hence the name) tools to help your server.

A Spimpel GroupManager

KitPVP - PVP With simple commands

Define shortcuts for commands and create custom commands.

AntiWitherDestruction, block Wither explosions!

Display of players, tps and memory in the web

Open a player's inventory with just one command!

This is a simple GUI based item editor.