Atlased
TexturePacker
Sprite Sheet Packer
Free Texture Packer
Stitches
Sprite Monkey
Sprite Sheet Animator
ShoeBox
Cyotek Spriter
TexturePacker
Sprite Sheet Packer
Sprite Sheet Animator
Free Texture Packer
Sprite Monkey
Stitches
ShoeBox
Atlased Cyotek SpriterTexturePacker - Texture Packer is hands down the best sprite sheet generation tool on the market.
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.
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.
Sprite Sheet Animator - Have a sprite that you want to show off?
Stitches - A template generator with functional CSS
Sprite Monkey - Small and fast but still full-featured sprite sheet editor.