WowAce

Automatic ammo reloading and selection, with warnings.

Shows guild and system message of the day only if either one of them has changed since the last login.

RaidGroupNumber

FuBar_NinjutFu

Shows optimal target to use various area healing spells

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

OneChoice tries to help you reduce quest reward choices down to, ideally, one choice.

Debuff Monitor: A Powerful & Configurable Raiding Tool

Display an arrow that points to a raid/party member anchored to raid frames

XArt

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

Menagerie

JostleLib

Adds resurrection, resurrected and soulstone status to Grid2. Uses LibResComm-1.0

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Shows a nice Soulstone Monitor.

Adds item values to chat messages.

Relog

Replacement of build-in loot frame

ERP