WowAce

TalentWhisper

Advanced Chat Filtering and Spam Blocking Addon

Adds Friend and Guild options to the context menu of player units.

Checklist and notes addon.

Enables you to see Chinese, Japanese and other languages in game

Customize the appearance of the chat bubbles.

Allows for easy congratulating when someone earns an achievement.

Tracks and announces interrupts (eg. Hit/Miss/Immune) and is also able to track and report "wasted" interrupts (those which d...

Lists and/or reminds people missing flasks or food buffs at every ready check.

Small addon to copy chat lines.

Converts incoming ALL CAPS CHAT into lowercase text.

Shows guild and system message of the day only if either one of them has changed since the last login.

Suppress chat messages when specified items are looted

Chat frame tweaking module for TweakHub.

Social tracking suite.

Displays online friends.

Congratulate people when they ding

A system config addon to WOW

Provides bang-whispers for your professions.

LootWhore