WowAce

Opens professions and shows their skill level.

Logs hunter's use of Feign Death

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

DKP ingame management

Crush Chance

Adds notes to item tooltips

SmartyCat

Buff and debuff timers with bars or icons.

Experimental timer library that uses the Animation system as a scheduler.

Whisp

Paints your known blueprints red.

Makes most default frames movable (mailbox, achievements window etc.)

LibRockComm-1.0

Check for flask/food buffs

Context-sensitive actions for certain frames on double-clicks.

FuBar_EpicCountFu

Enables the setup of the Shaman "Call of" spells

AntiInvite

Manage Raid Queues

Minimalistic LDB-based friends display