WowAce

MobHealth

Pop a chatframe warning about guild battle standard when boss health reaches 30%

Adds a button to your character and inspect window that shows a summary of gear enchants and gems.

ElfReloaded

FuBar_tTracker

Shows a nice Soulstone Monitor.

pMutilate

Adds Raid Target Icon status to Grid (Player or Player Target).

Vengeance module for Broker displays.

Adds a couple of graph displays to Skada.

Adds Outfitter set filters to AdiBags.

A simple addon that warns you if your pet isn't attacking while you're in combat.

Allows customisation of login/logout system messages.

Sorts the Wardrobe

A FPS Data Broker plugin.

A DPS Data Broker plugin.

FuBar_NetStatsFu

Cryolysis

Monitors AP when dots are applied, clearly showing current vs applied AP levels.

Prompts for canceling of pet battles if no rare pet is found in the opposing team.