Autodesk Maya is described as 'software is a powerful, integrated 3D modeling, animation, visual effects, and rendering solution' and is a well-known app in the Photos & Graphics category. There are more than 50 alternatives to Autodesk Maya for a variety of platforms, including Windows, Mac, Linux, iPad and Online / Web-based. The best alternative is Blender, which is both free and Open Source. Other great apps like Autodesk Maya are SketchUp (Freemium), Wings 3D (Free, Open Source), Cinema 4D (Paid) and Autodesk 3ds Max (Paid).
VoidWorld is a 3D modeling and animation tool. It provides a wide range of tools. The down load includes a few sample models and an online book which combines the user reference and tutorial examples, that would get you started quickly.
With an advanced clay engine and artist-tested tools, Sculptura is the most intuitive and powerful 3D sculpting app ever designed for your iPad. Sculpt engaging characters, ghastly monsters, or even intriguing abstract art anywhere you are.