DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Flickr - image and video hosting website
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Facebook Comments - Facebook comments plugin lets people comment on content on the site using their Facebook account.
PhotoPrism.app - PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.