WowAce

Timers for Buffs, DOTs, CC effects, etc..

Checks Raid Buffs/Flasks/Consumables. Tunable alerts for misdirects, taunts, cc breakage, rez, dispel and interrupt

Bulk mail reception made really easy

Track time played, rested XP and money for all characters

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Numerical and graphical display of Combo Points and similar buffs/debuffs. Also tracks Holy Power and Soul Shards.

A library to determine estimated range.

Lightweight Chat Improvements

StarTip (Tooltips from Outerspace)

Complete tradeskill information.

CT_RaidAssist style raid frames

Deus Vox Encounters

Drop the cheapest thing you're carrying

A library to help with localization of factions.

Auto repair + shows durability.

A simple combat log that displays events similar to SCT

All in one buffing mod for all classes. Paladin buff generated assignments based on Paladin capabilities and raid member sub-...

Data Broker Display similar to FuBar

Bayi's Extended Questlog

The Talent Template Editor