WowAce

Database of Trainer locations for HandyNotes

Save and load macros.

FuBar_VoiceFu

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

LDB data source for currency flow

Loudmouth

View party member quest logs

FuBar_FactionItemsFu

A library to help with localization of Zones.

KoS-Management Tool

ArenaMaster

HiveMind

Keeps track of space left in your bags.

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

SmartQueue

Hook extra menu to friend list, guild list and chat player

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

Toggles player names.

Scorchio!

RicoMiniMap