WowAce

Additional information about player spells.

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

Test whether the player can really dispell a buff or debuff, given its talents.

Modular casting bar.

A skinning engine for button-based add-ons.

Afflictions display and cleaning for solo, group and raid with advanced filtering and priority system.

Display auras on action buttons.

Timers for Buffs, DOTs, CC effects, etc..

Show buffs on nameplates.

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Caith skin for Masque.

Tracks the Blood Shield for Death Knights.

Textures for Stop Motion

Serenity skins for Masque.

Apathy skin for Masque.

Onyx skins for Masque.

Entropy skins for Masque.

Attach diminishing return icons to unit frames.

LiteStep skins for Masque.

Smooth combat HUD based on ArcHUD2