WowAce

All Flight Masters, flight duration and more.

Crowd-control monitor

FuBar_CRDelayFu

EnhancedLFG

PartyToGo

Keeps track of honor, PvP statistics, BG Marks, and Arena points.

Checklist and notes addon.

SpellWatch

Lexan

ScoreSort

Allows frames to be dragged around, without permanently changing their position.

Fixes strata bugs in UI windows

Improved Quest Tracker

Accelerates Camera Zooming

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

Saves contents of your guild bank and sends/receives updates over the addon channel

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Objective Tracker

A library to help with localization of Archeology dig sites

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