WowAce

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

Visual Raid Cooldown Tracking

GridLayoutPlus

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

Warnings about tanking specific abilities

A volume control for Data Broker.

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Poppins

Simple library that handles multiple levels of logging.

View any characters bank and bags from anywhere. Stores items in Baggins submenu "Anywhere Bags."

SwapMagic

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.

Don't underestimate your little critters!

adds navigation buttons to Encounter Journal

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

Lag tolerance module for Broker displays.

Helps you automate selling stuff.

Displays information about the current zone on the World Map for WoW Classic Era

FuBar_MonkeyQuestFu

Allows customisation of login/logout system messages.