WowAce

TrickOrTreat

KivinConsoleXP

FuBar_KCIFu

RepWatch

Display combo points for Arcane Blast debuffs

Keeps an eye on someone's distance from you, and alerts you if they get too far.

BigWigs_HealbotAssist

Simple and rich Death Knight rune customizations

Allows communication to be shared across realm through Battle.net.

This is an add-on to block incoming guild/party/duel requests (except for friends/party/guild) (previously ASSBlock)

AllYouCanEat shows information about the following statistics: beverages, foods, bandage types, potions, elixirs and flasks.

Adds Buff/Debuff icons to the grid frame.

Keeps track of your reagents.

Reputation

Clock plugin for any DataBroker display.

ChatAssist2Options

Never miss an Brain Freeze, Hot Streak or Missle Barrage proc

LootWhore

This addon helps with daily quests.

Enhances the Equipment Manager to let you control the helm/cloak visibility for each set.