MongoDB Atlas database, with CRUD actions handled by a Node.js back-end, using Express and Mongoose. Client side code is built up from create-react-app, react-strap components and all glued together with Redux. This web-app uses Json Web Token and bcrypt.js for user login and authentication, so you can write, edit and read your lists from anywhere.
Use the Google Maps APIs to search for specific businesses within a given search radius and rank them by user rating. This web-app utilises the maps, places and goecode libraries. Also the autocomplete api from the places library for text input.
Convert Roman numerals to numbers, or vice versa. This is a progressive web app (PWA) and can be installed to your phone or desktop computer. Although it is served via a traditional URL through a browser, you can then use it when off-line and it takes the appearance of a native app rather than a web page in a browser.