WowAce

Callback handling Library, normally embedded inside other libraries

Embeddable chat throttling library with traffic shaping and priorities

An intuitive keybindings library.

A library that handles the basics of "window" style frames

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

Good old LibTourist-3.0 for WoW Classic Era

Display auras on action buttons.

Postal: Enhanced Mailbox support

mount and companion manager

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

Arena unit frames

Mapster's Minimap brother

Database sharing module for GatherMate2

Achievements

Fade Blizzard Raid Frames

Gives equipped and overall iLvl to indicate the quality of a character's gear.

Am I locked out? - Displays all RaidIDs for all chars

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

Doublerightclick casting, autolure and sound enhancing

Library handling communcation for Magic* addons