Bukkit

Disable all Invisibility Potions on your server

Hides entities and tiles serverside to improve client fps

A Bukkit plugin that randomly puts wild animals in love mode, creating natural population increase.

Game time synchronization with real time.

A full menu that includes particle effects, fully configurable !

PerWorldPlugins allows plugins to be set to hook onto certain worlds using the config.

ObsidianBreaker

Experience dogs and cats in minecraft with many new features to add a new level of pet ownership to minecraft!

Completely Customizeable Death-Message Rewrite Plugin. Do it how you want!

Makes trade offers of villagers use fair prices, geared toward removing exploitability while leaving trading usable.

A Bug Reporting System with a Clean GUI ~ A Must Have Plugin for Server Owners

NETFire - Light netherrack on fire!

A very easy-to-configure item ban list, with default values for commonly-banned Tekkit items.

Craft Chainmail Armour, Horse Armour, Saddles, Name Tags and more with this simple, lightweight plugin

Flow

Prevent users from tab completing and revealing hidden commands

NoEntityGrief

OPControl [Inactive]

JoinMessagePlus allows you to change or turn off the join and quit messages of Minecraft.

PerWorldChatPlus