What are some alternatives?
When comparing ShoeBox and XnView MP, 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.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Flickr - image and video hosting website
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
TexturePacker - Texture Packer is hands down the best sprite sheet generation tool on the market.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.