Bukkit

The simplest sign editing plugin around! Shift+Rightclick to edit!

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

A Plugin to Put a Password for System a command, such as /stop in case you Dont want to do them

Easily control anything lightable or powerable in Minecraft!

Photon World Backupper

SQLinv

Stop breaking and placing of blocks if a player doesn't have a permission

teleport on saved locations

A fun group of absolutely random and somewhat useful commands.

ScLoad

Add more flags and features to WorldGuard regions.

Reset whole worlds, instantly.

AdminControl - Server Admin Desktop Client

A pretty easy-to-use in-game biome editor (requires WorldEdit to work)

WorldGuard Extra Flags

WorldWarp - No BS, Pure MultiWorld!

The Best Plugin for Integrating Adventure Maps onto your Server

ChainSaw

A lightweight plugin to load or generate a custom defined world

HomePoint