WowAce

Reminds you to Life Tap and Dark Pact

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

DelMapa

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Keeps track of space left in your bags.

Adds two icon indicators to each corner (total: 8 icon indicators).

Keeps track of durability and pops up a dialog to repair when you go to a vendor who can.

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

Outdated! Please use 'XLoot', available on Curse and WoWI

Adds pipes which can control arbitary other statuses (like toggle status on key or "in combat"-state).

Displays a grid of guild ranks versus permissions.

Upcoming events.

Short EPEEN

PartyToGo

Announces interrupts in the chat

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

SysMon plugin for any DataBroker display.

EnhancedLFG

Keeps track of your reagents for buffing.

PerfectTargets