David Galles atthe University of San Francisco created a fantastic website with animations that visual data structures and algorithms as they are executed.
Max Boeck has created a starter kit for building an emergency information website. The kit includes statically generated files, basic styling to help with accessibility, offline operation via a service worker, and is optimised for one ciritical roundtrip request with inline resources.
Compressimage.io is a browser based image compression tool that runs completely in the browser, meaning it works offline, is completely private, and results in zero server side emissions because there is no server!
Smashing Magazine put together a very useful list of starter kits and boilerplates that you can use to build websites quickly, using a number of web languages and frameworks, form PHP to Vue.js.
The Web Interface Handbook is a valuable resource of do's and dont's for web interface development, covering topics such as layout, forms, buttons, and patterns.
Adam Polak at The Software House published an interesting overview piece on the state of software architecture approaches available in 2021, complete with design patterns, case studies, and micro-services.