WowAce

Custom minimalistic nameplates

NabuFiveSec

TouristLib

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

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

Create reagents easily

Spy on your guild.

Show an in combat indicator

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

Omniscience

BetterOutbox

Resizes Blizzard raid frames, and adds additional options.

Taggle

RotLatency keeps track of your reaction to cooldown expiration.

API for AceConfig-3.0

Adds custom layouts for Grid

Compact scrolling vendor frame

TableTopLib

Configurable dynamic combat logging extender module for TweakHub.

FuBar_KTMFu