TexturePacker - Texture Packer is hands down the best sprite sheet generation tool on the market.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Free Texture Packer - Free Texture Packer is an open source tool that allows you to pack multiple images into one atlas for you games or sites.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Sprite Sheet Packer - Sprite Sheet Packer is online that you can easily use to pack sprite sheets, including data formats for CSS, LESS, and Phaser.
ZBrush - ZBrush is a digital sculpting and painting software solution.