WowAce

Give whispers an instant messenger feel.

Chat addon, filtering messages and UI changes

Scan for rare mobs so you can find them and their loot

Enables multi-line/unlimited-length pasting of text or commands into WoW

Tracks Raid/Instance/World Boss lockouts for all your characters, daily/weekly quests, currencies, trade cooldowns, and more!

Shared handling of alternate identity data between addons.

A friendly companion that remembers the chat.

Lightweight Chat Improvements

Watches your chat, flagging missplled words, and offering correctly spelled suggestions.

Redirect character errors, system messages and information messages.

Configure triggers to send messages to your raid team such as timers, rotations, and health/power based triggers. Raid smarter not harder.

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

A blizzard group finder replacement

Prat

Says random things in chat when casting any spell or ability. Type "/ss help" for the user's manual.

Tracks SendAddonMessage Spam

Set and manage character notes that are displayed in unit tooltips and /who results.

A collection of useful (guild management) tools and utilities for smarter than average bears.

Mutes various chat related annoyances while in capital cities and instances.

A Collection of Automations and Interface Tweaks.