Flickr - image and video hosting website
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Photobucket - Photobucket offers image hosting and free photo and video sharing.
500px - Connect, get inspired, and grow your skills.
Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
Pixpa - Pixpa is an all-in-one platform to create beautiful, professional portfolio websites, client galleries and online stores without any coding knowledge.