What are some alternatives?
When comparing ShoeBox and Flickr, you can also consider the following products
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
TexturePacker - Texture Packer is hands down the best sprite sheet generation tool on the market.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Dropbox - Online Sync and File Sharing
Photobucket - Photobucket offers image hosting and free photo and video sharing.
Ruler - It's a screen ruler for Windows.