Bukkit

Prevents Combat Logging

Walk over blocks and let them change!

Add traveling caravans that your players can attack for goods!

Reward your players for PvP and PvE with money.

Sticky Lapis allows Sticky Pistons to pull more than 1 block and lapis is now sticky material.

OreBag allows you to store near infinite amounts of ore with a command

Simple rename plugin for server owners to rename items with colour!

Plugin to (mostly) fix glitchy mobs in SMP

Prevent players from entering a safezone in combat

BaneGrenades is 1 out of 3 plugins in the Bows Are Not Enough plugin group created by Mendrinos.

An advanced, non-flicker, configurable Scoreboard!

Make mobs stronger further away from spawn!

Increase hunger rates and allow players to starve to death.

A Bukkit plugin, that makes fishing slightly more... unexpected.

A plugin that lets you edit diffrent mob aspects

Grow ores like sugar cane

New Blocks and Recipes via Resourcepacks like Conquest

Anti-TNT

Crafting Manipulation

World border plugin supporting a variety of shapes for each border.