WowAce

A library that handles the basics of "window" style frames

Cartographer_Routes

Provide plenty of links

T_Tracking

A fork of BananaDKP.

ItemValue

Show what quests have changed

Helps you decide which ability to use next according to priority you set

eeShards

AceBuffGroups

Utility library with shared functions and data for various addons by NeoTron.

TomTom CrazyArrow pointing to the targeted group member

LibItemInfo-1.0

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

Displays item durability and repair cost.

Pet Theory

Keeps track of time played and rested XP across your characters.

An Atlas Plugin that displays arena maps.

RicoMiniMap

An addon to assist with organizing healing in a raid set up.