WowAce

InstanceMaps

DHUD2

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

Rewrite myBindings. An enhanced key bindings interface.

Enables the filtering of items when you visit a vendor

FuBar_BongosFu

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

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

PoisonMenu

Open those clams (and other containers)

Uses guild notes to add alts' main names to chat windows and other places

DreamChat

Makes your item stats shine!

Sets the DND flag, when are in combat.

A Data Broker display for combat statistics.

LDB data source displaying rested XP for whole account

TradeStop

ImprovedRWF

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Keeps track of healing spells cast by everyone in a group.