WowAce

Evaluates your gear

ActionCombat

Notifies you of experience gains

In-game EPGP guild helper, supports standby, main/alt shared pools, minEP, offpecGP. Fixed price list with progress multiplier.

Displays events from Calendar for upcoming week in tooltip.

Vengeance module for Broker displays.

A frame with a text that gives you the amount absorb left on target, or in TankMode absorbs left on yourself.

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

ImprovedTargetFrame

Whats

Allow rule based automatic rolling on loot.

Modifies the inbox into a scrollable inbox, including open all options

Keeps track of healing spells cast by everyone in a group.

Announces interrupts in the chat

Lexan

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

Quest helping: fetching items to use, that sort of thing.

Embeddable library to track raid/party roster

GratuityLib

Adds Friend and Guild options to the context menu of player units.