WowAce

Expo

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

Libra

Interacts with TinyTip modules, either integrated or standalone, to provide extra centralized functionality. Required for an ...

Library handling communcation for Magic* addons

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.

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

Arcana-LFG is a broker plugin to show looking for group information, including call to arms

Buffalo

Kiwi Plates

A data broker display, that shows one block per plugin.

An Atlas Plugin that displays arena maps.

Keeps track of space left in your bags.

Add-on that shows which mounts can be farmed this week

TouristLib

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

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

Where the lore is at

Displays an alert whenever you loot an item for the first time.

Shows Status Bars that you can drag around and group up for your cooldowns