WowAce

MeleeFrame

Reports the total threat on a mob at the end of combat.

VendorSearch adds search features when buying items from any vendor

"Range finder/display for Discipline's Holy Nova"

Unit testing framework for World of Warcraft addon development.

Shows all the targets in the raid

Adds AFK status to Grid2.

Shows you a typing indicator when people are typing to you.

RepWatch

Adds combat feedback to oUF.

Mutes Annoying Sounds

A customizable buff/debuff display replacement for the default Blizzard frames (with right click cancelaura support).

GigaItemAuction

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

BossList

aX_RaidStatusConfig

GlyphRecolor

Crush Chance

A small datatext for ElvUI-using Shamans that gives them accurate info about their Reincarnation cooldown

EyeCandy