WowAce

Replacement for default bags.

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

GetInLine

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

Loot management tool

Adds a button to the quest completion interface which allows you to auto equips selected quest Item after completion

Displays the time until the next battle and more.

Simple and clean Death Knight displays

PreferredItems

A popup menu containing user-programmable scripts.

LittleTrouble

Tooltip of socials button will now show which friends are online

Adds a couple of graph displays to Skada.

Quest helping: fetching items to use, that sort of thing.

T_ItemInfo

A superior broker/LDB display for users of the Recount damage-meter.

Sanity2

Monitor the remaining duration on your Mysterious Eggs and other perishable items.

InstanceMaps

Simple library that handles multiple levels of logging.