WowAce

Additional information about player spells.

Database of Mailbox locations for HandyNotes

Allows the user to preview and track their progress in the collection of various transmogrification appearance sets

Adirelle's unit frames, based on haste's oUF.

Displays information about the current zone on the World Map

Plugs classical world style fonts into LibSharedMedia-3.0

Good old LibTourist-3.0 for WoW Classic Cataclysm

Violation

Try on different gear and see their total stats and their differences. In short, an ingame CT-Profiles-like addon.

Alchemy data for Ackis Recipe List.

A core for your informational plugins to plug into.

Dropdown library for Ace3 options, extensible to other options formats. Works ok.

ArcHUD2

Adds Scrolling Combat Text above your character

Display auras on action buttons.

Barks at you when you target a crowd-controlled unit

Addon to provide a much nicer map

Add-on that shows which mounts can be farmed this week

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

Displays online guild mates.