WowAce

Tells you if you're buffed

On login, displays changes to your guild since the last time you logged in.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Manages the SavedVariables of your addon with a layered hierarchy of settings.

Toggle Windowed Mode with click or keybind.

LDB data source for Combat Tracking

RBM

Client for allowing the raid leader to gauge interest on items in a method similar to a ready-check.

A Data Broker display for combat statistics.

LittleTrouble

Fancy up the PlayerPowerBarAlt frame

Powerleveling guide framework

Customizing your buff display

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

A threat main view module for Recount

Provides training reminders to help decipher the Blizzard Spell Alerts.

Allows for easy congratulating when someone earns an achievement.

Tooltip of socials button will now show which friends are online

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

Displays how many times you have jumped.