A comparison of these two addons.
A bag AddOn, with ludicrously-complex functionality.
It's display windows are built from 'virtual bars', where you assign categories to bars so that items in that category are displayed on the specific bars you want.
ArkInventory was slow as fuck to log in with or open my bags/bank with, though an update that introduced delayed start helped a lot. This was probably due to my heavy customization. I upgraded my computer.
A framework for manipulation of the world map.
See also Cartographer vs Mapnotes
A floating "crazy-taxi" style arrow that points you to your destination.
An auction addon.
Overwhelming, ugly and unusable.
Allows you to select your chat text for copying.
Shift-click a chat frame to enter 'edit mode'.
Simple and effective.
Designed to be a generally useful set of stuff.
I never really used this.
Highlights links in chat, which can be clicked to put it in the chat frame edit box for easy copying.
The Ace libraries for World of Warcraft.
It has since become a whole community for World of Warcraft addon developers.
A bar/panel addon for displaying various bits of information.
I tried it and didn't see any real use for it.