WowAce

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

Check for unenchanted and ungemmed items

Provides a library for accessing auction data and pricing from various Auction Data mods

SpellEventsLib

TrainingWheels

Mana regen rate display.

Blocks all whispers except from people in your guild and friends list.

Status indicator that shows if a unit is hostile (probably mindcontrolled)

LFD status via a DataBroker display rather than the minimap.

Adds simple coordinates to minimap frame

A library which provide tools for detecting adverse effects on units.

Monitors the combatlog identifying players from the oposite faction near you.

Send Messages encoded with the hexadecimal system

TalentWhisper

ReforgeSummary

Makes clicking the shields during the Atramedes encounter spammable

Displays the remaining time on grid icon's cooldown animation.

FuBar_OmenFu

Adds support for LibFilter to Baggins

Shared handling of media data (fonts, sounds, textures, ...) between addons.