WowAce

Centralised management hub for small tweak, interface and utility addons.

Tooltip text modiffier based on DogTag.

FuBar2

SimpleChatMods

Reputation Statistics - Gained, Needed, Rep/Hr, Session Time, etc.

Pick Pocket Countdown Timer for Rogues.

Status indicator that shows if a unit is hostile (probably mindcontrolled)

Keep tracks of Water Shield PPM

NiHao

Makes most default frames movable (mailbox, achievements window etc.)

nRaidTracker

Easy access to alts professions

An enhancement to the built-in raid frames to change color for debuffs.

A noble spirit embiggens the smallest player arrow.

VisualThemes

Automatically converts a party to a raid when you attempt to zone into a raid zone without a raid.

Hide frames of people you've ignored.

Crit stat monitoring and adds more detail to paper doll.

LibBase64-1.0

Adds "line of sight" status to Grid (after the error occurs).