Express.js is a simple Node.js framework for single, multi-page, and hybrid web applications.

Contentful is a headless content management system (CMS) that provides a flexible and scalable platform for creating, managing, and delivering digital content across multiple channels and devices.

ESLint is a linter for JavaScript that analyzes code to detect and report on potential problems and errors, as well as enforce consistent code style and best practices, helping developers to write cleaner, more maintainable code.

Gulp.js is an old but popular site building tool that automates various repetitive development tasks in web development, such as compiling Sass, minifying JavaScript, and optimizing images.