The best alternatives to SMĪLE are Aalo, Sticotti Shelving system, and Modsy. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tanka— Tanka = Slack + Glean, built for fast-growing startups.
Aalo is a Lego-like furniture system made with customizable, reusable, and hackable parts that let individuals be the designer. Aalo enables by-the-inch customization in just a few clicks and allows DIY designs to be created for unique spaces in a home.