Blender - Blender is the open source, cross platform suite of tools for 3D creation.
TextureLab - Free, Cross-Platform, GPU-Accelerated Procedural Texture Generator.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
NeoTextureEdit - NeoTextureEdit is an open source (GNU LGPL v.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Material Maker - Cross-platform, procedural texture generation tool.