Bukkit

NETFire - Light netherrack on fire!

black-/or whitelist blocks in WorldGuard regions

Change the color of your personal sky.

AnimalShop

Sync your chests with SyncChest

SWatchdog is ultralightweight blocklogger, similar to bigbrother. Also allows to rollback griefs in specified area

Have a seperate inventory and more, for each world

Who wants long wires? Go wireless!

A Safer Version Of WorldEdit

Removes the dirt screen that appears when changing worlds.

Makes snowtop grow larger over time using /snow.

Visualizes your WorldEdit selection with particles.

Change those mob spawner types!

Player created dungeons

Toggles the physics within a radius of the player.

PowerNBT

controlling vine length and growth in various ways

General commands for your server. Teleporting, item spawning, mob spawning, banning, private messaging, and more!

No Contains.

Generate world structures manually (villages, strongholds, temples, etc.)