Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Glitch is a collaborative programming environment that lives in your browser and deploys code as you type.
Leaflet is the open-source JavaScript library for mobile-friendly interactive maps.
Turf is a modular geospatial engine written in JavaScript.
Underscore.js is a JavaScript library which provides utility functions for common programming tasks. It is comparable to features provided by Prototype.js and the Ruby language, but opts for a functional programming design instead of extending object prototypes.
Unpkg is a content delivery network for everything on npm.
Varnish is a reverse caching proxy.