ZBrush is described as 'Advanced digital sculpting and painting tool with customizable brushes, real-time capabilities, and powerful rendering. Perfect for diverse creative fields' and is a popular 3D Modeler in the photos & graphics category. There are more than 50 alternatives to ZBrush for a variety of platforms, including Windows, Mac, Linux, iPad and Web-based apps. The best ZBrush alternative is Blender, which is both free and Open Source. Other great apps like ZBrush are 3D-Coat, Cinema 4D, Autodesk Mudbox and Bforartists.
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.
3D-Coat is the one application that has all the tools you need to take your 3D idea from a block of digital clay all the way to a production ready, fully textured organic or hard surface model.
CINEMA 4D is a commercial, cross-platform, high-end 3-D graphics application, produced by MAXON Computer GmbH of Friedrichsdorf, Germany. Noted for its flexible interface and ease of use, it is capable of procedural and polygonal/subd modelling, animating, lighting, texturing...
Autodesk Mudbox offers tools for creating detailed organic and inorganic 3D assets. It features an efficient layer workflow that allows blending, masking, and more, and has a familiar interface for sculpting and texture painting. Ideal for professional 3D modeling tasks.
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.
Armory is an open-source 3D game engine with full Blender integration, turning it into a complete game development tool. The result is a unified workflow from start to finish, making you work faster. No more jumping between different applications.
Nomad is a sculpting & painting mobile app, available on Android and iOS.
meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
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.
Sculpt+ is a digital sculpting and painting app, designed to bring the sculpting experience to your smartphone or tablet.
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it's free , more simple and has many other uses but it may not be as powerful as ZBrush in terms of performance or sculpting