WowAce

Tracks vulnerability debuffs on multiple mobs

Reorients the camera to be behind the character after a charge.

KillingSpree

Shows skills in a tooltip and allows them to be used.

A library to help with localization of Zones.

Keeps track of your current location.

Shows mana usage as a percentage in a spells tooltip.

Displays Instance Maps

RootsBidder

Incubator

LDB data source for Tradeskill Cooldowns

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Inspects all members of raid and saves in database, as well as lists people's dkp values

Adds predicted lists for spells while the user types

Load manager for AddOns

Easily mail friends, guild members, alts and others

Addon to switch all your AceDB profiles via slash command. This tool also allows you to emulate profiles for non AceDB addons.

provides enchanters with a decent tool for managing their profession

Keeps track of current money and all your characters on one realm.