WowAce

Mark My Words

Estimated time until current target will die.

Library handling communcation for Magic* addons

Keeps track of your reagents for buffing.

Test whether the player can really dispell a buff or debuff, given its talents.

NBuffBars

Review any raid or party members recent incoming combat along with health level.

Keeps track of current money and all your characters on one realm.

LittleTrouble

Helper functions used by my addons, feel free to use them in your addon too

MountUp

Allows the user to customize the the tooltip with lua-scripts

Announces Mage Spells in chat.

SmartyCatManaBar

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

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

RoleCall allows you to easily see the talent specs and roles of everyone in your group.

Talented_Data

Shows your standings with the factions.

BarAnnounce3