WowAce

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Data Broker Display similar to FuBar

Automatically turns on the combat log for selected instances

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Drop the cheapest thing you're carrying

Cirque Skins for Masque

Bulk mail reception made really easy

Display Cooldown Count of Spell Icon and Item

Apathy skin for Masque.

Achievements

A blizzard group finder replacement

Replaces the normal unit, party, target, pet frames and adds target-of-target.

Tracks herbs/ore/items that can be broken into component pieces

Shows you a much bigger icon selection frame

Onyx skins for Masque.

Entropy skins for Masque.

Bulk mail sending made really easy

Keeps track of group members and keeps an up-to-date cache of their specialization and talents.

A fancy LDB reputation display, show faction reputation and reputation change history

Adds countdown voices from Heroes of the Storm to BigWigs for all supported locales.