Bukkit

WorldEdit is an in-game map editor for both creative and survival

WorldGuard

CraftBook adds a number of original gameplay elements to Minecraft from integrated circuits to gates

Allows the admin to add blocks that can fall like sand and gravel.

Religion based warfare plugin, with custom religions and custom effects.

This plugin aims to fully convert FalseBook to CraftBook.

Make ops chat name blue and mute spamming players

Fixes the weak endermen problem, by enhancing endermen

Fireworks - A fun way to destroy griefers