WowAce

Resizes some default UI frames (GuildUI, LootFrame, RaidInfo, TradeSkillUI and TrainerUI) to show more lines

Simple and clean Death Knight displays

Sniff

Auto sizes frame layout depending on group/raid size or predefined zone data

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

Aspect checker addon for Hunters.

Monitors the combatlog identifying players from the oposite faction near you.

Insanity resource tracker for shadow priests.

MiniPet, Always keep your little companion with you, based on the work of Carra.

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

A library to help with localization of Archeology dig sites

Check the consumable usage of your raid

ArenaMaster

Standalone of FuXPFu - Now sticks to anything!

Simple, light-weight, LDB-enabled timer that tracks how long you spend in combat

Sphere

Prospecting and Disenchanting Aide

Configuration for LibToast notifications.

Shows your standings with the factions.

Expo