WowAce

Adds custom layouts for Grid

Announces results of readychecks to the raid/party, installs "/rc" alias, shows rc timer bar

Displays how much total honor you have from all sources.

Alert your friends when you ding, get an achivement, or get phat lewts!

MountLib

A library to provide coloring tools.

Adds Buff/Debuff icons to the grid frame.

A collection management library similar to .NET's System.Linq

Add TomTom Waypoints for Flight Masters in classic

Creates parameterized AceGUI-3.0 editboxes with autocompletion

Unsolicited

Keeps track of your reagents.

Small addon to copy chat lines.

Reverse Engineering will drill down and search your tradeskills for their elements

Selectively loots your fishing catches.

Show optimal path for artifact leveling

Automatically equip 'Chef's Hat' if the Chef enters the kitchen (Cooking TradeSkill).

A total number of quests Data Broker plugin.

Gnomish math at its best!

MouseLook