WowAce

Tracks profession specific cooldowns and items across all your characters

Simple language selection for Data Broker

Priority 3 loot announce addon

MiniChat

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

Keeps track of resurrection spells cast in a group

XP and Reputation bars

A library to help with localization of Archeology dig sites

Uses guild notes to add alts' main names to chat windows and other places

Visual loot monitor

Simple library that handles multiple levels of logging.

Ace2'd version of the "Visor" frame-modifictaion AddOn. All code in this addon is copyrighted 2006 by its authors, which are...

NRT_EPGP

Lag tolerance module for Broker displays.

Lightweight time/date display with optional hourly chime.

TrackingBar

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

FuBar_RaidBuffFu

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Displays events from Calendar for upcoming week in tooltip.