WowAce

Keeps track of HoTs, DoTs, Buffs and Cooldowns. With audio and text alerts to refresh them.

Rebuff yourself with the mousewheel.

Modular and lightweight party/raid frames.

Displays the locations of Garrison music scrolls.

Displays online guild mates.

Regain that wasted space!

Displays online friends.

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

A bin for all your LibDataBroker buttons

The Talent Template Editor

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

A customizable casting bar replacement for TBC Classic & Classic WoW

Quest History tracker and shows lists of quests in each category

An extension to the default WoW Unit Frames.

A library to provide information about zones and instances.

OneBank3 will combine all the bank bags into one frame.

View an image of your guild vault from anywhere.

Deathknight Rune Display

Keeps track of your current location.