ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
Flickr - image and video hosting website
digiKam - Professional Photo Management with the Power of Open Source
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
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.
500px - Connect, get inspired, and grow your skills.