First there was pDebuffList, then Demon, and now we (www.dtguilds.com) present something we've developed, Smarty. This addon allows you to filter any debuff, or a set of debuffs as a single profile, and get visual represenation.
This Addon is designed to be flexible to suit the needs of a raid leader by tracking every vital debuff, or a single raid member by tracking their own and of their class.
None of these debuffs are limited to a specific class. Track Sunder Armor and Expose Armor in a single profile, and Mangle as a rogue. Track CoE as a Mage, or CoS as a Shadow Priest, along with your own DoTs. Track Demoralizing Shout and Demoralizing Roar in a single profile as a Bear, and distinguish between them very quickly.
Icons are automatically loaded when the debuff is first found, so ignore the question mark icons at first. You can also override the icon by manually putting it in.
Note: This addon is going to be updated using WoWAce 3.0, till then, please refrain from posting bugs about this version.