WowAce

Tooltip of awesomeness. Moo. It'll graze your pasture.

View bank, inventory, mail, equipped and guild bank contents from any character anywhere!

Assessment

A UI for searching the guild roster.

Good old LibTourist-3.0 for WoW Classic Era

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

GDKP gold run ledger

Tracks SendAddonMessage Spam

ArcHUD2

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Displays information about the current zone on the World Map

CT_RaidAssist style raid frames

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

Displays item durability and repair cost.

Dynamic mount macro generator

Provides the /in command for delayed execution.

Adds Scrolling Combat Text above your character

Alchemy data for Ackis Recipe List.

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

Addon to provide a much nicer map