As I’m constantly checking my technology / library stack I currently stumbled across updates to the AR.js library, which now also features GPS based tracking. Jeromee Etienne, the former maintainer of AR.js already did some work to make the library usable with other WebGl platforms including babylon.js. Now they are focusing again more on on three.js only (which makes sense in terms of focusing on new features).
I created an issue concerning the future use of other WebGl librarys (including my all-time favorite), maybe some discussion / joined forces could be initiated.
Please also see:
I know that in the long run WebXR will be the primary way (if apple finally gets moving), but in the meantime such features could be valuable. See also Playcanvas, which also integrates basic jsartoolkit support.
As soon as i have some spare time I will check the old jsartoolkit + babylon.js integration (Babylon 2.5)
But maybe other people are interested in a cleaner integration als well.