Bukkit

WorldEdit is an in-game map editor for both creative and survival

WorldGuard

The Bukkit World Management Plugin.

A new perfect way to clear common lagg in your server!

Portals module for Multiverse-Core

Grief Prevention

The premier long-range map editing tool for Minecraft SMP.

Creates images and pixel-art using in-game blocks

Create user friendly menus to travel to worlds

The multiworld plugin made by ferrybig

With this plugin you can cut down an entire tree by breaking the bottom part!

Remove lag and improve the performance of your server significantly with this tool!

Toggles the physics within a radius of the player.

CoreProtect

Players in creative can 1-hit-kill mobs when crouching

Nether Portals module for Multiverse-Core

Allows one person to sleep, without others on server having to sleep or log.

Inexpensively protects your ores from cheaters.

CraftBook adds a number of original gameplay elements to Minecraft from integrated circuits to gates

FastAsyncWorldEdit