WowAce

PoisonSwapper automatically manages weapon swapping for maximum DPS

Bind a key to cycle through party members

Grid module to emphasize units based on some configured conditions.

"At-a-glance" armory overview of your/opposing raid

Opens professions and shows their skill level.

EPGPAttendance is a mod that estimates raid attendance based on observed changes in EP.

Allows custom Combat Log filtering

ChatAssist2Options

AEmotes

Automate talking with the chatty gnome at Chimaeron's lair

google protobuf for world of warcraft

Menagerie

Combat log analysis

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

Context-sensitive actions for certain frames on double-clicks.

ConfigMode support for various addons.

An easy-to-follow guide for visiting all of the Lunar Festival Elders.

Adds simple coordinates to minimap frame

TrafficJam

An in-game list of all hunter pet families and their abilities.