Jekyll is a static site generator written in Ruby that allows you to create simple, fast, and secure websites without the need for a database.
Documentation themes are built specifically for writing technical and product documentation. They are normally written and maintained in Markdown. The often include a navigation menu, search bar, clear headings, semantic document structure and clean typography.
A template or theme refers to a pre-designed layout or structure that provides a basic framework for building a specific type of application or website. It typically includes good design, placeholder content and functional features, allowing developers to customize and fill in the details according to their specific needs.
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.