WowAce

Static library of wow map data

FuBar_TimerFu

Calculates DKP based on Item Level

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

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

Estimated time until current target will die.

Volume control panel.

Tailoring data for Ackis Recipe List.

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

item2phpBB

Allows the user to customize the the tooltip with lua-scripts

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Dropdown library for Ace3 options, extensible to other options formats. Works ok.

Good old LibTourist-3.0 for WoW Classic Mists of Pandaria

Heads-up minimap display

BananaBar2

Gathers statistics on certain chance-on-use spells, also known as procs.

FuBar_uFriends

EasyTrack

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