WowAce

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

Death analysis tool

A replacement tradeskill window for Classic

Does stuff for sachmo

TomTom CrazyArrow pointing to the targeted group member

Show where the chests are for Withered Army Training

Smart raid loot and DKP tracker with automated standby and learning

Bind spells, items, and macros to keys, without using action buttons

Shows ZoneInfo on the World Map in a perfectly cromulent fashion.

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

A library to help with localization of in-game subzone names.

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

Shaman totem bar

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Switch macro depending on zones or BigWigs boss modules.

Barks at you when you target a crowd-controlled unit

Tracks, transmits and displays the cooldowns of your raid.

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

Displays the locations of Garrison music scrolls.

StarTip (Tooltips from Outerspace)