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.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
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.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.