Flickr - image and video hosting website
Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
novaGallery.org - Beautiful php image gallery - easy to use, with modern responsive design, private mode, themes, languages
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.
PhotoStructure - PhotoStructure is a complete photo and video management application designed for the whole family.