Apple's ARKit provides a way to situate stories in the viewer's real environment using augmented reality on Apple devices.
Reality Composer by Apple is an app for producing and prototyping AR experiences directly in AR without prior 3D experience.
Oculus Quill is a VR illustration and animation tool that allows users to paint in 3D layers.
Tilt Brush by Google is a simple, easily augmentable tool for 3D painting in cross-platform VR.
Unity is a popular game engine used to develop dynamic mobile games and XR experiences.