WowAce

Says random things in chat when casting any spell or ability. Type "/ss help" for the user's manual.

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

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

Quickly see what counter-combinations your epic followers cover and which ones are likely to get a new combination when rerol...

Scorchio!

BeneCast 10

Smooth group roll frames

Database of important locations for HandyNotes

Tracks skill and tradeskill costs and progressions, as well as trainer locations.

SmartQueue

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Death reports

Automagical macros for each talent tier.

Allows you to browse your clients database

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

A library to return spell duration and debuff type of a spellID.

Sniff

Simplifies GDKP bidding processes

Jigsaw

fmBuffCheck