You need to create an Interface folder in your Warhammer directory and an Addons folder in the interface folder. It should go like: C:\Program Files\War\Interface\Addon s. All of your addons should go in that folder.
Oh, and
http://war.curse.com/downloads/details/13510/ is required for most of the addons listed here.
http://warbeta.curse.com/downloads/details/13702/

Vertigo allows you to customize action bar layouts - set the number of columns, the number of buttons on the bar, show/hide the pagers or background for each bar, and whether or not to show empty slots.
CleanUnitFrames | Warhammer Online: Age of Reckoning Addons | Warhammer Online @ Curse.com
planb | Warhammer Online: Age of Reckoning Addons | Warhammer Online @ Curse.com
Well, after much screwing around, I've got a working mod that updates the main hotbar page whenever your balance/plan state changes. I called it Planned Balance, or PlanB for short. You can download it here:
AutoLoot | Warhammer Online: Age of Reckoning Addons | Warhammer Online @ Curse.com
Makes it so you don't need to hold down shift to autoloot everything on a corpse.
WhinySpellTimer | Warhammer Online: Age of Reckoning Addons | Warhammer Online @ Curse.com
ActionBarColor | Warhammer Online: Age of Reckoning Addons | Curse
Tints the entire button red instead of just the binding text if the current target is out of range, out of LOS, et cetera.
ActionPoints | Warhammer Online: Age of Reckoning Addons | Curse
Provides a simple (and movable via the Layout Editor) frame that displays your current action points.
Clock | Warhammer Online: Age of Reckoning Addons | Curse
Real time clock, no idea why this wasn't included in the default UI.
Mechanic | Warhammer Online: Age of Reckoning Addons | Curse
For those that don't like the default dark magic/combustion/righteous fury/waaagh display for whatever reason. Provides a simple movable+scalable numeric display for the current value of a class' mechanic (includes support for shaman/archmage dual-mechanic).
Moth - Addons - Curse

Tooltip mod
Squared - Addons - Curse

Grid for war, not sure what the big deal is but apparently it's a huge deal for anyone that played a healer in wow.
EMonitor | Warhammer Online: Age of Reckoning Addons | Warhammer Online @ Curse.com
Quote:
This mod constantly keeps your friendly target set to the person with the lowest health that is in RANGE and LOS of a defined spell. This way a healer can spam one of their heals and be assured that it will do something useful.
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You're probably a terrible healer if you use that but there it is if you want to.
SpamMeNot - Addons - Curse
SpamMeNot intelligently detects, blocks and reports commercial and annoying spam messages before you even see them, without relying on an extensive list of blacklisted domain names.