WowAce

Library to aid in the classification of Mounts

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Context-sensitive actions for certain frames on double-clicks.

Pick Pocket Countdown Timer for Rogues.

Automatically equip 'Chef's Hat' if the Chef enters the kitchen (Cooking TradeSkill).

Pet Theory

Reforges stuff

Adds tier set number and difficulty indicators to tier item tooltips.

Add rare locations into GatherMate2.

Vengeance module for Broker displays.

Automates sending/accepting group invites in several different situations.

This is an add-on to block incoming guild/party/duel requests (except for friends/party/guild) (previously ASSBlock)

Display aura information inside action buttons

Converts incoming ALL CAPS CHAT into lowercase text.

Announces ooze kill instructions during the Yor'sajh encounter in Dragon Soul. Highly customizable with numerous helpful feat...

Raid Frames using the oUF framework.

Show coordinates on minimap

Easily mail friends, guild members, alts and others

Enables cooldown notification between players and allows party members access to each-others spell books.

Posts a BigBrother-QuickCheck to the raid-channel when a readycheck is started