WowAce

Adds cooldown timers to your trinket procs

Shows a window displaying any raid member below 10,000 health during the Chimaeron encounter.

Go quick, or go home!

Records mail when visiting the mailbox to make keeping track of mail and expiration dates easy.

Auto sizes frame layout depending on group/raid size or predefined zone data

Tooltip scanning library.

Fires events whenever a raid member "fails".

Tweak the tradeskill windows

Replacement for WoW's flash/fade functions.

Adds achievement reminders to BigWigs

Shows guild and system message of the day only if either one of them has changed since the last login.

Library to provide visual bar creation and management.

Niagara

FuBar_RecapFu

Plays amusing sounds whenever you skin a mob

DeuceCommander

Proximo

CraftBot

Light-weight enhanced casting bars

VisualThemes