I originally created Website Launch Checklist as a bit of an experiment to find out if owning an domain name which exactly matches a given search term is of any particular benefit to SEO (turns out not really, so I eventually gave up the domain).
The content is clearly nothing revolutionary, but since the fairly simple original version I've redesigned the site a couple of times when I've been learning a new technology or just wanted something to fiddle with. Its current guise was created when I needed to refamiliarise myself with Redux, so it's built in Next.js with Redux/Redux Toolkit and Redux Persist handling all of the state management.