Bukkit

Add lootable chests to your ruins!

Multiworld-Manager/-Teleporter

A very complete, lightweight and updated UltraHardcore plugin

WorldGenerationControl

[ADMIN][COMMANDS] UsefulCMDs: A Collection of Useful Commands for Server Admins

Auto select any structures as a WorldEdit selection

Allows you to enable fly mode in specific WorldGuard regions.

EndReset

Add more flags and features to WorldGuard regions.

worldguard-based plot buy/sell system

Lightweight multi-world management & protection for bukkit powered servers

Tired of grass invading your dirt paths... Use this!

Teleport

A plugin that allows easy use of explosions!

Allows player to sculpt their world by drawing land or water as well as various other tools

BlocksDrop

GhostMode - fly through blocks!

Create regions (built in in-game region creator) and execute commands on region enter or leave

ChunkVisualizer - Easily allows you to view chunk borders.

Move, Copy, Change and Remove Structures, Landscapes