Flickr - image and video hosting website
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Anchor CMS - Free and lightweight blogging system
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.
Textpattern - Textpattern is an elegant content management system that is free, open source software.