WowAce

Adds aggro coloring to oUF.

Shows a window displaying any raid member below 10,000 health during the Chimaeron encounter.

Shows a money overview for your current realm in the tooltip on the money in your bags

Open those clams (and other containers)

CraftBot

Replacement for WoW's flash/fade functions.

Records mail when visiting the mailbox to make keeping track of mail and expiration dates easy.

WoWonid

PartyToGo

Manages the SavedVariables of your addon with a layered hierarchy of settings.

Hunter 'Misdirection' activity and cooldown monitoring for raids/groups. 'Readiness' aware.

Displays both Kalecgos and Sathrovarr the Corruptor hit points during the encounter.

Light-weight enhanced casting bars

Omniscience

Simple and rich Death Knight rune customizations

Restores channels and channel-window associations after disconnects remove them.

Provides a quick display for the LFG Call to Arms

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

Displays online friends.

Mob respawn timers