WowAce

Toggles WoW to the forground on events.

Heads Up Display with Player and Target Info

Shows Status Bars that you can drag around and group up for your cooldowns

A sexy logarithmic cooldown bar

Piece of mind by being one with your class.

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

KoS-Management Tool

A Data Broker display for combat statistics.

Desesperated announcing to clearly show the skillings of act inplay.

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

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

Entertaining kill-shot notification.

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

Alternate Rune Display

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Death reports

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

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

Estimated time until current target will die.