WowAce

Timerbar embeddable library

FuBar_TimerFu

SimpleChatMods

Short EPEEN

Add-on that allows you to setup and quickly switch between different profiles of your action bars

ClassColors

Makes those pesky garrison animations go away.

Auto sizes frame layout depending on group/raid size or predefined zone data

CBRipoff

Shows learned recipes of all characters.

tekProber

Allows customisation of login/logout system messages.

LDB data source displaying rested XP for whole account

Library to aid in the classification of Mounts

LDB Broker launcher for HealBot

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

Prompts for canceling of pet battles if no rare pet is found in the opposing team.

DreamChat

Bidder for DKP points. Usable as standalone bidder, or with DKP - Manager to manage points.

An extra set of 11x3 buttons, integrated into the default action bar.