WowAce

Helper addon for the Zul'Drak daily "Troll Patrol: The Alchemist's Apprentice"

Adds a simple percentage threat status to Grid.

Display LDB launcher

Small addon to copy chat lines.

ChatStamp

Chat frame tweaking module for TweakHub.

Minimap tweaking module for TweakHub.

Improved Mailbox

Changes the quest log back to how it was before Patch 6.0.

Broker launcher plugin for Recount

Lightweight line-based info-display frame

KivinSpamGuard

Adds tooltip for debuffs (and other things? you found out: no).

Makes the message dialog movable

Broker launcher plugin for Blizzard Equipment Set

Converts commonly used acronyms into hyperlinks.

CleanShot

LDB display of the players current damage percent modifier

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

With Mists of Pandaria Blizzard publish all characters from an account unless you disable that 'feature'. This addon warns you.