WowAce

Good looking, smoothy and helpful nameplates

MeleeFrame

AnyFont

A data broker plugin showing your longest fight and your current fight time.

Adds an additional spell alert if you have more than one charge of a buff that is normally tracked by the in game spell alert...

Adds Outfitter set filters to AdiBags.

Reports the total threat on a mob at the end of combat.

Simple and rich Death Knight rune customizations

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

Aggro Warning System for Parties and Raids.

FuBar_GrindFu

MobHealth3_BlizzardFrames

Calculates the relative value of attributes towards physical dps.

A simple addon that warns you if your pet isn't attacking while you're in combat.

Keeps an eye on someone's distance from you, and alerts you if they get too far.

SCT_Cooldowns

Shows all the targets in the raid

Add in keybindings to place raid marks on mouseover, or the target if there is no unit being moused over

See all incoming casts on your target. Also includes resurrection monitor. Uses libhealcomm-3.0 and librescomm-1.0

Notifies you when you get aggro.