The best free alternative to Autodesk Mudbox is Blender, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Autodesk Mudbox and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Autodesk Mudbox are Bforartists, Sketchfab, SculptGL and Paint 3D.
A comprehensive open-source 3D software suite for modeling, UV unwrapping, texturing, rigging, and animating. It supports renderings, simulations including fluid and cloth dynamics, complex compositing, video editing, and Python scripting, running across all major operating systems.
Bforartists is a complete 3D suite to create 3D content. It offers you the full 3D art pipeline to create game graphics, prerendered movies and stills.
Sketchfab is the first web service to publish interactive 3D content online in real-time without plugins.
Paint 3D is Microsoft's totally rebuilt and enhanced version of Microsoft Paint built for Windows 10 and with extensive 3D support as well as other helpful, long-needed additions like pen support and easier cropping feature.
Clavicula is a free 3D modeling software aimed at artists and users of all levels. It allows you to quickly give shape to your artistic, design, or engineering ideas, to create highly complex objects using a relatively simple toolkit.
meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
Compatibility DLL for running Blender 3.x on Windows 7 and a patch to modify the Blender source to use it.
View, capture, personalize, and print 3D models. Download many kinds of 3D files and edit them using the 3D modeling space. Take a picture with your webcam and make it 3D.
ZModeler (or Zanoza Modeler) is a 3D modeling application. It is aimed at modelers who model for computer games such as 18 Wheels of Steel, Grand Theft Auto, Need for Speed, Midtown Madness or similar video games.
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Not specifically for sculpting or painting. Hard to understand.