WowAce

Simple Spell Alert

Displays Instance Maps

Manufac

Switch macro depending on zones or BigWigs boss modules.

Incubator

manipulate the minimap in numerous ways; move, scale, skin.

Incoming Heals

A replacement tradeskill window

Fires events whenever a raid member "fails."

Friends list improvements: notes, remembering the information of offline friends, friend list syncing and backups, and a fuba...

Drop the cheapest thing you're carrying

A library to provide information about zones and instances.

Alternate Power- and Combopoint/SoulShard/HolyPower-bar

Auto repair + shows durability.

XRS

One large inventory.

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

A core for your informational plugins to plug into.

TuiRaidTracker

AutoMagicly clicks though Daily Quests, and Turns them In.