WowAce

A replacement tradeskill window for Classic

View bank, inventory, mail, equipped and guild bank contents from any character anywhere!

Library providing mappings between trade skill recipes, spells and created items

Death analysis tool

Shows ZoneInfo on the World Map in a perfectly cromulent fashion.

Angry Raid Points

Addon to provide a much nicer map

Compact rune and proc display for Death Knights.

Target Debuff monitor. Stacking aware, giving current and potential debuff status.

Tracks SendAddonMessage Spam

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

Switch macro depending on zones or BigWigs boss modules.

Keeps track of your current location.

Says random things in chat when casting any spell or ability. Type "/ss help" for the user's manual.

Dynamic item DKP calculation

An auction house AddOn to make the life of each fence easier.

Friends list improvements: notes, remembering the information of offline friends, friend list syncing and backups, and a fuba...

Does stuff for sachmo

Attach diminishing return icons to unit frames.