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.

Creates images and pixel-art using in-game blocks

Portals module for Multiverse-Core

Grief Prevention

Create user friendly menus to travel to worlds

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

The multiworld plugin made by ferrybig

Toggles the physics within a radius of the player.

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

CoreProtect

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

Nether Portals module for Multiverse-Core

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

FastAsyncWorldEdit

Inexpensively protects your ores from cheaters.

Powerful, craftable Wand items and Spell scripting

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