WowAce

Tooltip of socials button will now show which friends are online

Allows the user to customize the the tooltip with lua-scripts

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

Tools to easily compare gear among party members.

Shows what stat was reforged in item tooltips.

Show extra information about Jewels and Enchants in tooltips.

Never forget which one in that 5-mob pull casts what spell again.

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

Mob respawn timers

LCDs for WoW

Keeps track of Gimps and warns you if you end up grouping with them.

Adds information about the items tokens can purchase and vendor location to tooltip

LibQTipClick-1.0

Item link modification

Ratings

Shows the Guild Achievements Points and Members in the tooltip

Enables RatingBuster to calculate selected buff effects even if you don't really have them

Addon to add more information on a Tooltip to the GuildRoster

Adds tier set number and difficulty indicators to tier item tooltips.

Calculates the relative value of attributes towards physical dps.