Flickr - image and video hosting website
Ceremony - Ceremony is the fastest-growing wedding photo collecting application that allows you to easily collect all your wedding pics from guests.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Wedew - Wedding E-invitation & Website
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.
Wedbox - Wedbox is known as one of the best wedding photo app that lets you easily collect all your wedding photos and videos from guests.