Rift brought addons to the game last summer. After some problems in November when addons had to be disabled, they apparently work again. There are 83 addons currently at Curse.
http://www.curse.com/addons/rift
Here are some some popular addons.
http://forum.mmosite.com/thread/2/127/20111213/Rift_Addons_Collection-
4ee84a10f22dc9613-1.html
Here's how to download and add them to your game.
http://forums.riftgame.com/rift-general-discussions/general-discussion/261083-installing-addons.html
***************************
Copyright Solo MMO Player at http://solommo.blogspot.com
The Solo MMO Player collects links to the most useful or interesting MMO websites, databases and blog entries I have found, with a bias toward topics of interest to the Solo Player. Use the search box in the upper left hand corner to find topics. Kelari NPC Warrior art courtesy of Game Fluid.