WowAce

Display the global cooldown around your cursor. (+ other stuff)

Visual Raid Cooldown Tracking

Displays events from Calendar for upcoming week in tooltip.

ActionCombat

Keeps track of time played and rested XP across your characters.

LDB broker for group interrupts

A data broker plugin showing your longest fight and your current fight time.

Sneakily inspect how much gold your mouseover target has made so far.

A standalone version of Angry Assignments to create and display personal notes on your screen.

Sniff

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

Displays a grid of guild ranks versus permissions.

Quickly assign the highest follower to each building or unassign all of them.

Utilities for pixel perfection, decimal to hex, parsing item strings

Uses guild notes to add alts' main names to chat windows and other places

FuBar_RecapFu

Color manipulation library.

LDB data source for Tradeskill Cooldowns

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

Tankalyze