WowAce

Restores channels and channel-window associations after disconnects remove them.

Right-click on minimap blips to open a targeting menu (out of combat).

Provides information of tradeskill and crafting materials that are in the banks and bags of your characters.

Allows the user to customize the the tooltip with lua-scripts

Short EPEEN

Dropin replacement library for SetBackDrop

Recap

Angry Raid Points Client

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

Target assistance by automatic rewriting of macros

FuBar_uFriends

EquivalencePoints

A Perl layout with oUF.

Shows a nice Soulstone Monitor.

Cartographer_NoteTarget

Tracks specialization and talent data for group members

RainbowEnchants

FuBar_RecapFu

Allows for easy congratulating when someone earns an achievement.

A Data Broker plugin to show AddOn memory usage.