Killshot is a simple addon that will display a message each time you make a killing blow.

Floating Combat Text of awesomeness. Caw. It'll eat your crackers.

Estimated range display.

Sim-based priority/rotation helper for DPS and tanking specializations.

Send chat announcements when you interrupt a spell cast.

Prettier nameplates.

oRA3 is a raid leading addon, offering loot settings, invite settings and more.

PVPSound, a simple, light-weight addon that plays UT3 sound effects on killing blows and specific BG events.

Shows an image and plays a sound when you get a killing blow.

PvP timer and cool down tracking addon

Simple, nice-looking power bar addon for all classes.

A customizable addon that will announce and track when you get a killing blow.

Disease Tracker for Death Knights.

TargetAssist provides unit frames that track tanks and main assists in your party or raid, along with their current targets.

Shows your best crits with all abilities!

Announces Cooldowns and Spells on usage per Whisper or to your party/raid/curstom channel!

Various Useful Tools For The Mage Class.

Visual Raid Cooldown Tracking

Announces your successful interrupts to party/raid

Acheron provides an easily readable glimpse into the cause of death for anyone in your raid or party.

A basic threat bar

Piece of mind by being one with your class.

Changes your in-game floating combat text in to a calligraphy stylized font.

ChiBar is a simple Addon, which provides a Frame for a Monk to observe his Chi.