WowAce

Keeps track of current money and all your characters on one realm.

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

fmBuffCheck

LDB data source displaying rested XP for whole account

Does a /who search of multiple dungeons.

Automagical macros for each talent tier.

A library to return spell duration and debuff type of a spellID.

Allow rule based automatic rolling on loot.

Shows a circle on the minimap to indicate spell range

DHUD2

Adds manabars to the sides of Grid frames.

FuBar_uGuild

Warnings about tanking specific abilities

WhiteboardNG

Battleground Timers in a HUD around the Blizzard BG status

eeShards

EQCompare

Toolset for tanks, providing information on taunts and other valuable information.

Client for MagicDKP which handles standby calls and bidding on items.

In-game EPGP guild helper, supports standby, main/alt shared pools, minEP, offpecGP. Fixed price list with progress multiplier.