WowAce

Scans your Equipment for cumulative item bonuses and sums them up.

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

Heads Up Display with Player and Target Info

Database of Trainer locations for HandyNotes

Dropdown library for Ace3 options, extensible to other options formats. Works ok.

Bind spells, items, and macros to keys, without using action buttons

Tracks whispers and conversations

Add-on that shows which mounts can be farmed this week

FuBar_SWStats2Fu

BigTrouble

item2phpBB

Prints a message in your default chat frame when someone in your group gains an aura.

Tracks the precise arrival & departure schedules of boats and Zeppelins around Azeroth and displays them on the Mini-Map and ...

Display front-end for LibGuildPositions-1.0 using HandyNotes

Shows the health of the player's current bodyguard.

HiveMind

Simple oRA3 Maintank Target Frames, based on oUF

Show what quests have changed

Gives a Smoother Quest Experience

RoleCall allows you to easily see the talent specs and roles of everyone in your group.