WowAce

CharScanner scans Basic Character Data, Talent Specifications, Equipment, PvE/PvP Achievements, PvE Boss Kill Statistics and ...

lern2count adds ABinfo castcounts to spell and actions. It has a builtin reagentcount too.

Toggles player names.

A Library for stat conversion, calculation and summarization.

Lets you drag UI frames around

Displays friend notes in unit tooltips, at logon, and in /who results.

Note + rep tracking for players, with guild data sharing.

Taggle

SinkLib

A tool to appraise, estimate, or judge your equipment against the equipment of others.

Flames anyone who lets his debuff expire on Malygos Phase 3

OneView

Draws some lovely 3D portraits in the standard Blizzard artwork.

Used to visualize and change values of variables/variable-trees in game

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

Fixes strata bugs in UI windows

Fancy up the ExtraActionButton frame

Manager for DKP points. Requires DKP - Bidder as main Graphic User Interface.

Combat log replacement

Does a /who search of multiple dungeons.