WowAce

DKP system for all guilds in the Banana Republic.

Provides shareable notes and other information for your guild, party and raid community.

Tracking and ranking of dps/hps in a guild.

Friends & Guild Data Broker plugin.

Displays a grid of guild ranks versus permissions.

Angry Raid Points Client

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

Manages tracking of raid attendance, loot, and more.

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.

Calendar improvements

Does stuff for sachmo

FuBar_uGuild

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

Bidder for DKP points. Usable as standalone bidder, or with DKP - Manager to manage points.

Uses guild notes to add alts' main names to chat windows and other places

A tool to appraise, estimate, or judge your equipment against the equipment of others.

YssGuildShop

HazLoot

Eliminates the spam from the chatframe and sums it up in a broker plugin.

Waitlist addon with EPGP Mass Award hooking.