Not free, but you can use it developer mode to create compelling image-based Augmented Reality experiences. Great tool
Tools to help you create Augmented experiences.
A library to be used with AR/VR tool A-Frame that provides the ability to import 3D panorama frames.
Create AR audio walks with this tool.
A search engine to find XR sites.
An app with which to make AR (Mac)
Fabulous, free, AR making tool.
A huges collection of articles about AR and VR projects