WowAce

Ignore more than 49 people, autoshared between your alts

Rawrkitty

IDCard

Shows the group leader, raid assistants, and master looter in Grid.

Automatically sells low quality gray items to the vendor.

Shows where the equipment of inspected users or yourself is from.

Library for tracking mouse gestures

Converts incoming ALL CAPS CHAT into lowercase text.

oUF element for highlighting debuffs that are dispellable by the player

Lets you drag UI frames around

GirlFriend

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

Hunter pet manager for any DataBroker(LDB) display.

Status indicator that shows if a unit is hostile (probably mindcontrolled)

GPriceEach

Saves Auction House search queries.

CraftBot

Provides training reminders to help decipher the Blizzard Spell Alerts.

Tweak the tradeskill windows

WFtotem