I plan to to start learning how to make AR project with Unity3D (for iOS).
I would like to know which kind of plugin is good in this field especially for Marker AR like this http://augmentedev.com/home.php#home
Could you share with me some experience or documents?
Thanks
I have used the Vulforia AR plugin by Qualcomm.
It is really easy to setup and use, and it includes several Unity examples.
On top of that, it is also 100% free.
Great, I will test it. Thanks Sir 
Hi Sir-Tiddlesworth, do you have any experience about commercial license of Vuforia?
No I don’t sorry.
Is there any other AR package for Unity3D except the vuforia?
I would like to check some to compare the performance
Here is another AR package.
I have never used it though.