WowAce

On login, displays changes to your guild since the last time you logged in.

View an image of your guild vault from anywhere.

A FuBar plugin for Converge Guild Officers.

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Allows customisation of login/logout system messages.

Friends & Guild Data Broker plugin.

YssGuildShop

Shared handling of alternate identity data between addons.

Allows for easy congratulating when someone earns an achievement.

Need Greed window for EPGP lootdistribution.

Squawk

Displays online guild mates.

Loot management tool

Flashes the Chat Tab when receiving a guild message

Raid loot tracking and text generation

Learn all the fights with this addon.

Saves contents of your guild bank and sends/receives updates over the addon channel

Automatically invite players based off magic words. Features : Queue players, blacklist, guild only invites, custom spam control

Mail Minion

A UI for searching the guild roster.