WowAce

Enhances the StackSplitFrame with numbered Buttons, a '1-Click Mode' and a 'Auto Split Mode'.

GridLayoutPlus

Fancy up the ExtraActionButton frame

T_ItemInfo

Adds a couple of graph displays to Skada.

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

Simple and rich Death Knight rune customizations

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

Cartographer_Noteshare

FuBar_FuXPFu

Automatic tracking of the current target's creature type. For the discerning PvE hunter.

FuBar_ExitFu

Flames anyone who lets his debuff expire on Malygos Phase 3

Library supporting plug in filters.

Taggle

Monitors the combatlog identifying players from the oposite faction near you.

On login, displays changes to your guild since the last time you logged in.

cgCrafty

Shows the spec of people around you in the tooltip.

WF3sec