Re:Form Sculpt is a modern, browser-based take on ZBrush-style sculpting. It's free, real-time collaborative 3D sculpting in the browser, and it doesn't use AI. Nothing to download or install: it runs on WebGPU on most computers and tablets (not phones). Re:Form's engine is written for WebGPU from day one, and the mesh stays resident on your GPU.
Re:Form is v0.9.1 Alpha. It has 36 brushes and tools, GPU subdivision into the millions of triangles, layers, symmetry and masking, vertex paint, renders and turntables, and a Timeline slider back through every step of a sculpt. OBJ and STL import and export on every plan; Pro adds GLB and FBX. The Free plan is permanent, with the full toolset, no card and no time limit. Pro is $9.99 a month or $99 a year.