WowAce

mHud

Save and load macros.

BankAccountant

Scans your Equipment for cumulative item bonuses and sums them up.

Note + rep tracking for players, with guild data sharing.

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

FuBar_CombatTimeFu

Automatic tracking of the current target's creature type. For the discerning PvE hunter.

Uses guild notes to add alts' main names to chat windows and other places

TradeStop

Announces Mage Spells in chat.

FuBar_ExperienceFu

ChatHighlighter

Make it easy to explain bosses in Raids.

Buff reminders and more

Adds 3 indicators to each side (top, bottom, left and right).

Adds aura indicators to unit frames

Keeps track of healing spells cast by everyone in a group.

FuBar_AbramsFu