Bukkit

Peaceful Player brings peace to specific players on your server. Monster won't attack specified players.

Enables the /spawn command and plugin configuration properties

UnderwaterTorch - Torches (and more!) stay Underwater/Lava [1337]

MobSpawners

A bukkit plugin that adds simple time and weather commands.

Block Deny in Selected World

A simple, lightweight plugin to stop players from editing the world on your server.

EggBlock

A Simple plugin to move chests without dropping the inventory.

Create your own insland in SkyFactory

A Minecraft bukkit mod that allows the frequency with which weather occurs to be reduced by a certain percent

Allows you to log your chat effectively.

Lays redstone for you

Sets weathering for Cobblestone and Stonebricks

Let your plants grow!

Mop

Confining players within designated areas

A better /back command

A simple easy-to-use plugin, that allows you to manage your server

Mob Spawner Killer