WowAce

TabletLib

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

Show extra information about Jewels and Enchants in tooltips.

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

Modifies the inbox into a scrollable inbox, including open all options

Helper functions used by my addons, feel free to use them in your addon too

Heads Up Display with Player and Target Info

Fires events whenever a raid member "fails".

Helps you decide which ability to use next according to priority you set

Reminds you if your flask/elixir and/or Augmentation Rune and/orfood buff is about to expire or has expired

mHud

Tracking and ranking of dps/hps in a guild.

WQA helps you find world quest groups easily. Works after the 4/28 group finder changes.

Displays the time remaining before your (temporary) pet is dismissed.

Adds talent specialization role status to Grid.

Adds your name to chat messages

Assister

FuBar_TransporterFu

Collects, analyzes and presents information about the virtual economy.

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