Bukkit

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

WorldGuard

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

The Bukkit World Management Plugin.

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

Grief Prevention

Portals module for Multiverse-Core

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

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

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

The multiworld plugin made by ferrybig

CoreProtect

Creates images and pixel-art using in-game blocks

Create user friendly menus to travel to worlds

Nether Portals module for Multiverse-Core

FastAsyncWorldEdit

Inexpensively protects your ores from cheaters.

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

Toggles the physics within a radius of the player.

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