Gamaray's Source Code is Free to Download

 
Development on the Gamaray AR Browser has stopped. There is an open source project (not affiliated with Gamaray Ltd.)

where you can download the source code and contribute.
You now have the opportunity to merge your virtual world with the real world. Gamaray is a free augmented reality browser for Android devices that uses the compass and GPS to place virtual 3D objects over the camera preview screen. The application finds, downloads, and interacts with these virtual objects using a web service called a "dimension". The platform is open, allowing anyone with web development skills to publish their geo-located content. 

http://www.gamaray.com/