Hello Claudio,
Please see below SDKS.
1. GART was created to help people quickly and easily build Augmented Reality applications for Windows Phone and Windows 8.
This kit is different from other AR kits in that it enables what we call “Geo AR”. Where other toolkits place virtual things on top of specially printed tags, this toolkit places information on top of real places in the world around you. It does this
by tracking where you are and the direction you’re facing.
https://gart.codeplex.com/
2. SLARToolkit is a flexible Augmented Reality library for Silverlight and Windows Phone with the aim to make real time Augmented Reality applications with Silverlight as easy and fast as possible.
https://slartoolkit.codeplex.com/
3. Goblin XNA is a platform for research on 3D user interfaces, including mobile augmented reality and virtual reality, with an emphasis on games. It is written in C# and based on Microsoft XNA Game Studio 3.1 (up to Goblin XNA v3.6) and 4.0 (after Goblin
XNA v4.0).
http://goblinxna.codeplex.com/
With Regards,
Krunal Parekh
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