WowAce

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

Tracks interrupts

Displays how many times you have jumped.

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

Shows your standings with the factions.

Tracks skill and tradeskill costs and progressions, as well as trainer locations.

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Give logical progression of Mining, Herbalism & Skinning. Will not be updated with WoD zones

Displays reagent count on spell action buttons

WQA helps you find world quest groups easily. Works after the 4/28 group finder changes.

Quest library for mob location and other information

Incubator

Check the quality of wild battle pets

Accelerates Camera Zooming

Shows Chat as Combat Text

Allows you to preview weapon glow in Dressing Room.

Allows for easy congratulating when someone earns an achievement.

Proximo

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

provides enchanters with a decent tool for managing their profession