WowAce

Shows a countdown bar for the duration of auras (e.g. HoTs, DoTs)

Mail plugin for any DataBroker display.

Zone text Data Broker plugin.

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

Automatically restock items from vendors and your bank

GonffBar

vChat

LDB display addon with one Blockoblock per plugin.

Opens professions and shows their skill level.

Adds TargetIcon status to Grid2 (player / player-target).

Calculates the relative value of attributes towards physical dps.

PoisonSwapper automatically manages weapon swapping for maximum DPS

BetterOutbox

Converts commonly used acronyms into hyperlinks.

Hunter 'Misdirection' activity and cooldown monitoring for raids/groups. 'Readiness' aware.

Display LDB launcher

LDB port of TimeToDie, showing estimated target life expectancy in an LDB object

Adds Debuff Highlighting to oUF.

Shift-clicking on a user name in chat shows a tooltip with their whois information.

BarAnnounce3