WowAce

opens/closes all bags when at merchant (instead of only the backpack)

Sphere

Adds on-screen buttons for the farming tools and seeds.

Show extra information about Jewels and Enchants in tooltips.

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

Displays the time remaining before your (temporary) pet is dismissed.

A library to help with localization of Archeology dig sites

Bind spells, items, and macros to keys, without using action buttons

DataBroker display using minimap buttons.

Adds filters for Legion items to AdiBags

Simple Spell Alert

Visual loot monitor

Scans your Equipment for cumulative item bonuses and sums them up.

Test whether the player can really dispell a buff or debuff, given its talents.

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

Creates virtual cyphered chat channels over guild addon communication channel.

Visual Raid Cooldown Tracking

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

BiGOpt

adds navigation buttons to Encounter Journal