Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
Flickr - image and video hosting website
Inferno - An extremely fast React-like javascript library for building modern user interfaces.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Glimmer - Fast and light-weight UI components for the web
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.