WowAce

Skip the gossip and select the normal NPC action

Congratulate people when they ding

Adds notes to item tooltips

Configure which layout or profile to load on entering a zone

A simple, zero config, trash item seller

oUF element for highlighting debuffs that are dispellable by the player

Monitors the combatlog identifying players from the oposite faction near you.

FuBar_TinyTipFu

Make the unit frame fade if out of range.

A customizable casting bar replacement for TBC Classic & Classic WoW

Keeps an eye on someone's distance from you, and alerts you if they get too far.

Provides bang-whispers for your professions.

Shows the spec of people around you in the tooltip.

Filters unimportant Buffs.

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

iTargetingFrames

Data broker for keeping track of your Ankh cooldown.

Fail display for Recount based on EnsidiaFails filtering options

Smooth combat HUD based on ArcHUD2

Displays Currencies as a Data Broker source