Hi Tim—
I just looked and my suspicions were confirmed; yes, you can download an alpha of Sculptris which is about a decade old, at Softonic
But Pixelogic bought it quite a quile back and transmogrified the3 product into (free) ZBrush mini-core, which has a $$$ big brother they push, but that's not the point.
ZBrush mini-core has updated tools, can export to OBJ, and the people DO update it. I just received a new version (you need to register) with quite significant number of new operations.
Free ZBrush mini-core
Also, also, Autodesk offers a free basic sculpting program called MeshMixer MeshMixer, which appears to be a new development and not Mudbox, which they acquired ages ago. The unique thing about this as an entry-level sculpting program is thast you can import an OBJ file and mess with it...hence "mesh mixer".
Happy sculpting, in any case.
—g
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