The best alternatives to Rapid Mockup are iPhone 3D Mockups, Vectary, and MockRocket. If these 3 options don't work for you, we've listed a few more alternatives below.
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MOCKUPZ is library of handcrafted 3D mockups that can help you sell your products and designs in a better way. Thanks to the multiple scenes you have unlimited options to present your work.
A browsable and searchable community built directory of Mozilla Hubs scenes and rooms. Find hidden gems and get inspired. This project aims to be a searchable catalog/directory for public Hubs Rooms (and other open 3D/XR platforms).