Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
Flickr - image and video hosting website
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Adobe Photoshop Express - Easily edit and share your photos in no time!
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.