WowAce

Customizable text display of character's power.

Adds Auctioneer "bought for" filters to Baggins ("disenchant", "vendor", etc)

Artifact power bar support for oUF layouts

Hides the Order Hall Command Bar

Bloodthirst

Show a bar indicating the unit's Soul Shard count.

Provides accurate, millisecond-level timing.

Joins the LFG channel automatically.

Adds TargetIcon status to Grid2 (player / player-target).

Scrub

Mana regen rate display.

KeyProfiler

LDB broker for group interrupts

Shows the Guild Achievements Points and Members in the tooltip

Buff and debuff timers with bars or icons.

Zone text Data Broker plugin.

Raid Warning filering module for TweakHub.

Tacticial pet battle information so you can be a Pokemon master

With Mists of Pandaria Blizzard publish all characters from an account unless you disable that 'feature'. This addon warns you.

Synchronise friends among your characters