WowAce

Toggles player names.

Options for TinyTip

Automagical macros for each talent tier.

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

RoleCall allows you to easily see the talent specs and roles of everyone in your group.

FuBar_ChatLockFu

Sniff

RapidCast

Stores a browsable database of spells that mobs cast

DeclineDuel

Resizes some default UI frames (GuildUI, LootFrame, RaidInfo, TradeSkillUI and TrainerUI) to show more lines

InspectFix

TradeStop

FuBar_uFriends

Mapster's Minimap brother

Reno is a slash-command that can patch predefined options in a macro to change which actions will be chosen.

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

FuBar_TimerFu

Aperture

Doublerightclick casting, autolure and sound enhancing