WowAce

Lists and/or reminds people missing flasks or food buffs at every ready check.

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

A library to help with localization of Archaeology artifacts

RS_ClassColors

ArenaHistory

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

Simple Bars for your Shaman's weapon buffs and shield spells.

kgPanelsConfig

Assistance to the dance during Dread Spray

AbacusLib

BossWhisperer

Target assistance by automatic rewriting of macros

Calculates incoming damage avoidance and mitigation

KC_PlayerFramePlus

GridStatusIncomingHeals

Drops the least valuable item in your bags to make space.

nRaidTracker

Adds 3 indicators to each side (top, bottom, left and right).

agUF style oUF layout

Cartographer_ExtractGas