Bukkit

Items4Respawn

McSmash

This plugin disables regen at will.

Finds the Player's Ping with the "/ping" Command!

Make itemframes invisible with shears

Provides free configuration , although it's made for begginers. Check this out.

With this add-on you can set the lives, hunger and more of the players in your server. If you want can plugin in your server, install this plugin in your server.

Give yourself a cookie with /cookie!

FreeCookies

Make sure the server hasn't lagged out!

This plugin allows to drop all blocks in a selected region

Fun block plugin!

RedstoneJumper

This is a plugin that takes /msg to the next level. create chatrooms to talk to more than 1 people at once

Hide Other Players To reduce Lag!

Adds a potion and splash potion that can get rid of potion effects.

Use Slack to send/receive minecraft server chat messages

CivCraft: A Civilization Building Mod

This plugin works great as a creeper egg in factions.

Stop those pesky people potty-mouths with SwearNot