Sketchfab

Sketchfab A 3d model repository; often times the models can be viewed in VR on the Sketchfab website as well

Arkio

Arkio Description from Quest store: “import reference images, 3D models and scenes from Unity, Revit, Rhino, SketchUp, LiDAR apps and more.” Free/monthly pricing. Mac app appears more limited than pc app.

Nanome

Nanome allows you to explore molecules in either an augmented or virtual reality environment. You can view molecular models, expand them to room size, rotate them, and more, and have multiple viewers explore molecular structures at the same time. Great for chemistry and biology.