Bukkit

A simple and lightweight chat manager that can restrict the usage of words

Request group plugin

A stats plugin to let players and server owners check stats in game or in the flat file.

This is the Official GroupBot plugin

gtAdmin

Configure your Tab Completions !

Stores basic information on a scoreboard

Info Command

Keep an eye on your friends by receiving push messages on your iOS device using Prowl!

A sleep notification plugin for SMP servers

Track Players time in each world

ServerLogs

Logs any block places and breaks of commandblocks

Frosty 1.1 [CB1060]

View and export (xml, txt) basic info about installed plugins

Engrave lets you easily rename the item in your hand

SimpleAchievements

mmoInfoCoords

VoteHelper will supply your users with links and rewards for voting!

Gives warning if tools, armor piece or elytra reaches an X% of the durability