WowAce

Displays a grid of guild ranks versus permissions.

PerfectTargets

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

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

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

A simple range indicator for optimizing Halo damage.

A death track window for Recount

Tracks whispers and conversations

Custom minimalistic nameplates

A PitBull4 module which shows an arrow that points to raid members

TalentWhisper

Adds an additional spell alert if you have more than one charge of a buff that is normally tracked by the in game spell alert...

What actual item level is an item? Yes, it's horrible we need a library for this.

FuBar_MiniClockFu

MobHealth

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

ItemEnchantApplication

PreferredItems

opens/closes all bags when at merchant (instead of only the backpack)

Automatic ammo reloading and selection, with warnings.