Block-based 3D modeling that feels like Minecraft with tools: start from a cube and chisel, add and paint blocks to make a model. Very approachable for kids and beginners, with a free plan and paid plans for more features. Runs in the browser and as a desktop app.
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SelfCAD
selfcad.com
Browser-based 3D modeling that combines sketching, sculpting and mesh tools with a built-in slicer, aimed at beginners, hobbyists and schools. A free plan covers basic use; advanced tools need a subscription.
Hi3D
hi3d.ai
AI tool from Hitem3D that turns a photo or a text prompt into a detailed 3D model you can print, with image-editing tools to prepare the picture first.
CookieCAD
cookiecad.com
Browser-based designer for custom cookie cutters and stamps: draw, type text or upload an image and it generates a printable cutter. It also runs a marketplace where you can buy ready-made designs or printed cutters.