Picaboo - Picaboo is a web-based image publishing and printing service that allows you to create personalized photo books, cards, and scrapbooks.
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.
Juicebox - Spectacular HTML5 Image Galleries Made Easy
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.
Walmart Photo - Walmart Photo is a fun way to turn your pictures into art and embed it into everyday goods.
Sprite Monkey - Small and fast but still full-featured sprite sheet editor.