The best alternatives to XR Tools are Gravity Sketch, LiveTour, and VR Sketch. If these 3 options don't work for you, we've listed a few more alternatives below.
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Easily create 3D forms using volumetric shapes. Model with intuitive tools that allow you to explore variations of expression and add detail as you sculpt.
Ideal Reality is home to a curated set of resources that you would need to start your journey as a creator/designer into the realm of augmented, virtual reality and other sister technologies.