Zbrush is an innovative, powerful, 3d model manipulation tool. You are able to sculpt a model as if it were clay, import and export objects between other 3d modeling software. Zbrush is best for modeling orgainc forms; humans, animals, plants, but of course you could do a lot more. In general the main method of manipulating the mesh is by use of a brush which displaces the mesh smoothly, as if adding clay or removing clay with a brush stroke.

Minimum System Requirements
OS: Windows 2000
CPU: PIII
RAM: 512MB (1024 MB recommended)
Monitor: 1024x768 monitor resolution (32 bits)