Bukkit

SimpleThirst is the easiest customizable thirst plugin out there!

PlayerHealthVision

Test your plugins but stay OP!

Bow Warfare - Reloaded

http://dev.bukkit.org/bukkit-plugins/thclearchat/files/1-thclear-chat-v1-0/

Completely Manage Your Server Entities and Events

A lightweight, easy way to play Minecraft Ultra Hardcore with your friends.

TP to players beds.

WarpViaSign

This plugin provides a lightweight way for servers to transfer players using the Server Redirect mod to another server address

CommandBooks allows you to create books that run commands on right click.

Bypass invisibility potions.

Allows you to set different times for different WorldGuard Regions

A plugin that gives right click cooldown to a certain block type

Allows you to create graveyards where players will spawn upon death

Manage Player's XP!

ApocHardcore

Hard-link nether portals to exact destinations — no more vanilla portal roulette. Built for chunk loaders, orbital cannons & precise portal networks.

Provides admins some tools to have fun with (at expense of) players.

Bows with Effect!