WowAce

Displays the remaing cooldown of the action you tried to use

Food/water macro generator

Floating Combat Text of awesomeness. Caw. It'll eat your crackers.

Reports on a configurable dashboard or to group chat on consumables, buffs, AFK, mana and many many others but in an intellig...

Numerical and graphical display of Combo Points and similar buffs/debuffs. Also tracks Holy Power and Soul Shards.

Aloft

Configurable Castbars

Compact rune and proc display for Death Knights.

Deus Vox Encounters

Death analysis tool

Calculates optimal reforging for given weights/caps.

Barks at you when you target a crowd-controlled unit

The core module for RW

Entertaining kill-shot notification.

A sexy logarithmic cooldown bar

A simple combat log that displays events similar to SCT

Deathknight Rune Display

Fires events whenever a raid member "fails."

AnyFont

Adds Scrolling Combat Text above your character