WowAce

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

A customizable casting bar replacement for TBC Classic & Classic WoW

Adds custom effects to your cursor.

Tracks your keystones

BarAnnounce3

Shows the mirco menu and game menu in a clickable broker tooltip.

A library to help with localization of talent trees.

Provides a LibDataBroker plugin for quick access to professions under Ackis Recipe List.

TabletLib

Provides shareable notes and other information for your guild, party and raid community.

Cartographer_QuestObjectives

tracks and share quests between your party

Switch macro depending on zones or BigWigs boss modules.

SRA

Various libraries based on LCD4Linux, offering users lower-level UI customizations.

Simple quest item bar.

FuBar_PTReagentFu

Open those pesky lockboxes

Litmus

A data broker display, that shows one block per plugin.