WowAce

Simple oRA3 Maintank Target Frames, based on oUF

Provides the the health and target of by an unit targeted mob (meant to be used for tanks).

Show a relative threat bar.

A simple visual combat log with spell/skill icons for Classic WoW

Tank statistics Data Broker plugin.

OneHitWonder

Aggro Warning System for Parties and Raids.

Displays oRA3 main tanks.

Displays an animated bar with next enemy swings

Displays how much your Shield Barrier will absorb if it is used at any given moment.

Resolve module for Broker displays.

Tracks who in your raid/party has Vigilance

Displays a table for possible outcomes of incoming hits with their probability

Measures your TPS

Caser

Auto-assigns raid targets to group member's crowd control abilities

Times your instance runs. Aim for a new record!

Show helper indicators for units conditions (buffs, states, etc).

Add a threat display to nameplates

Health and stagger tracker for Brewmaster