WowAce

Reports in raid chat whenever a raid member "fails." /EnsidiaFails to configure.

Loudmouth

manipulate the minimap in numerous ways; move, scale, skin.

LibItemInfo-1.0

Quest History tracker and shows lists of quests in each category

Tracks vulnerability debuffs on multiple mobs

Marks the locations of Hallow's End candy buckets on the worldmap and minimap.

QuestAnnouncer

Show item durability and quality in the character frame.

Shows simple Buttons for your Cooldowns :)

A replacement tradeskill window for Classic

QuestLog

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

tekProber

HideTalkingHead

Modular and lightweight party/raid frames.

Keeps track of your top hits, heals, criticals, etc.

A fancy LDB reputation display, show faction reputation and reputation change history

Switch macro depending on zones or BigWigs boss modules.

FuBar_VampwatchFu