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!

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

Portals module for Multiverse-Core

Grief Prevention

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

The multiworld plugin made by ferrybig

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

Creates images and pixel-art using in-game blocks

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

Create user friendly menus to travel to worlds

Nether Portals module for Multiverse-Core

CoreProtect

FastAsyncWorldEdit

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

Inexpensively protects your ores from cheaters.

Toggles the physics within a radius of the player.

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