WowAce

Simple Bars for your Shaman's weapon buffs and shield spells.

LDB data feed plugin designed to display various statistics derived from the Recount addon.

Makes the Blizzard options frame movable and resizable

FuBar_AssistFu

Lists Pots and Herbs you got on all chars and allows you to specify color coding

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

TalentWhisper

Modifies the inbox into a scrollable inbox, including open all options

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

A library that tells wether a item is a quest item or not (equipped or in bags)

Automatically and immediately cancels all in-game cinematics and movies

Allows you to loot BoP items without prompting when not in a group or raid

BossWhisperer

Automatically sells low quality gray items to the vendor.

Records mail when visiting the mailbox to make keeping track of mail and expiration dates easy.

MAcon

Color manipulation library.

Keeps track of gold and cash flow across multiple characters

TunnelVision

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