WowAce

A superior broker/LDB display for users of the Recount damage-meter.

Displays friend notes in unit tooltips, at logon, and in /who results.

Draws some lovely 3D portraits in the standard Blizzard artwork.

Keep your pet fed

Stable

Mark My Words

Lightweight time/date display with optional hourly chime.

It's a doodle pad for doodling with doodles.

SpellWatch

InstanceMaps

Group interrupt cooldown tracking.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

MiniChat

item2phpBB

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

Status indicator that shows the remaining of value of Powerword shield.

Track any items you want in a tooltip

mDarkPact

Adds various hearthing items to AdiBags virtual groups

Shows you which bosses you've killed next to the raid finder frame.