WowAce

Rebuff yourself with the mousewheel.

Checks your gear before bosses and yells at you if you're an idiot

CT_RaidAssist style raid frames

Textures for Stop Motion

Reports in raid chat whenever a raid member "fails." /EnsidiaFails to configure.

All in one buffing mod for all classes. Paladin buff generated assignments based on Paladin capabilities and raid member sub-...

Additional information about player spells.

Tracks the HoTs you cast.

Attach diminishing return icons to unit frames.

A collection of Rogue modules.

Display aura information inside action buttons

Tracks the Blood Shield for Death Knights.

BuffMe

Target Debuff monitor. Stacking aware, giving current and potential debuff status.

Barks at you when you target a crowd-controlled unit

FuBar_PuntFu

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

Shows you the radius of your totems.

Tracks vulnerability debuffs on multiple mobs

Personal buff monitor - are you buff enough?