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

Creates images and pixel-art using in-game blocks

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

Create user friendly menus to travel to worlds

The multiworld plugin made by ferrybig

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

CoreProtect

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

Nether Portals module for Multiverse-Core

Toggles the physics within a radius of the player.

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

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

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

Inexpensively protects your ores from cheaters.

FastAsyncWorldEdit