WowAce

Checks your gear before bosses and yells at you if you're an idiot

Adds a status to Grid for debuffs applied by Raid Bosses.

Antagonist

Violation

Provides one or many informational windows with optional interactive widgets.

Display front-end for LibGuildPositions-1.0 using HandyNotes

Barks at you when you target a crowd-controlled unit

Kaliban's Class Loot List Star Display

A replacement tradeskill window for Classic

Co-ordinated targetless Party and Raid wipe recovery. Evolved

DKP system for all guilds in the Banana Republic.

Says random things in chat when casting any spell or ability. Type "/ss help" for the user's manual.

Keeps track of your top hits, heals, criticals, etc.

Displays Instance Maps

Displays the locations of Garrison music scrolls.

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

Mutes various chat related annoyances while in capital cities and instances.

Adds Scrolling Combat Text above your character

Questing minion

A sexy logarithmic cooldown bar