WowAce

lern2count adds ABinfo castcounts to spell and actions. It has a builtin reagentcount too.

Library to provide non-explicit cooldown tracking and callbacks.

Fade Blizzard Raid Frames

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

Fixes UI bugs

Watch tooltip updates to announce when you find specific objects

Custom minimalistic nameplates

RotLatency keeps track of your reaction to cooldown expiration.

Buffalo

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

ItemPriceTooltip

Provides access to all teleporting spells and items on right click of minimap button.

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

Displays friend notes in unit tooltips, at logon, and in /who results.

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

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

Track any items you want in a tooltip

Provides more visible access to dungeon and raid difficulty settings via FuBar.

Speeds up triggering actions such as items or spells by triggering them on key/mouse down rather than release

A clone of the FailBot mod. Announces raid member failures such as "Player1 fails at frogger"