WowAce

Allows customisation of login/logout system messages.

Announces interrupts in the chat

LDB data source for herb, ore and skinning node data

adds navigation buttons to Encounter Journal

NRT_EPGP

SimpleChatMods

CleanShot

Doublerightclick casting, autolure and sound enhancing

Captures chatframe Tradeskill Links for later reference in an easy to read format

Client for MagicDKP which handles standby calls and bidding on items.

Saves who searches in a favorites list.

Adds easier gear switching to FuBar.

BanzaiLib

Rewrite myBindings. An enhanced key bindings interface.

GPriceEach

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

RefillRemind

Track any items you want in a tooltip

Helper functions used by my addons, feel free to use them in your addon too

ArenaHistory