WowAce

Collect data about you myth+ challenges

Adds options to create customized layouts from within grid.

Adds unreal tournament style sounds to PvP encounters.

FuBar_CraftTimersFu

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

DeclineDuel

Square Minimap and more

Adds achievement reminders to BigWigs

xchar

DarkCandy

RBM

Shows who controls Wintergrasp and the time until the next battle.

Keeps track of gold and cash flow across multiple characters

SanityBags

A Data Broker plugin to show AddOn memory usage.

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

Heal and decurse by clicking on customizable raid/party unit frames

Library to help with querying unit talents.

RootsBidder

A tool to appraise, estimate, or judge your equipment against the equipment of others.