WowAce

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

Death reports

Captures chatframe Tradeskill Links for later reference in an easy to read format

Announces Mage Spells in chat.

First Aid data for Ackis Recipe List.

Clean looking square minimap with many options.

Sheppard

Hemlock

Add-on that shows which battle pets can be farmed this week

HiveMind

FuBar_FuXPFu

Buff reminders and more

FuBar_KTMFu

Set the clicking action for Grid buttons

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

Gathers statistics on certain chance-on-use spells, also known as procs.

Shows a nice Soulstone Monitor.

Raid Cooldowns

Displays friend notes in unit tooltips, at logon, and in /who results.

SmartQueue