WowAce

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

A creative frame managment library

Adds spell-based range checking to Grid, and the ability to check multiple ranges.

Responds to DBM version checks, so that you don't have to.

Adds information about the items tokens can purchase and vendor location to tooltip

Guild members

Warn players about a specific aura (buff/debuff) at a specific stack via whispers and icons.

Automates sending/accepting group invites in several different situations.

switches Bartender4-profiles when changing spec

Broker_CalendarEvents

Provides cooldown timers for abilities you want to track

Adds PvP status to Grid frames.

Simple LibDataBroker based launcher to toggle MonkeyQuest.

Color player names in chat by their corresponding raid class colors

AceGUI-3.0-Search-EditBox

BiSList allows you to configure your BiS items list, and keep track of how far you are from them

Extended math library for Lua

Removes HP buffs when Infest debuff hits player.

A simple buff remover.