Bukkit

Spouties

Adventcalendar generates an advent calender for you with many customizable options

SeruBans

ChunkUp, keeps chunks loaded.

DeathSpawnR

Remove Them Mobs And Stop The Targeting Terror!

A minigame similar to "Woodchips" or "Marco Polo"

CustomItems

Customize the MOTD for different ranks with in-text variables

An economy based upon physical items

Endless Jukebox Rotation

RandomLocationButton

Death chests for the masses!

Dogtags

Generates a SethBling SkyGrid map

Make it hard to convey your wares

Prevents lava and water spam.

Admin Tools

Multiple parties with GUI controls and shared inventories

This plugin is still very new. But there are still some cool features! :)