Jekyll is a simple, blog-aware, static site generator for personal, project, or organization sites. Written in Ruby by Tom Preston-Werner, GitHub's co-founder, it is distributed under an open source license - wikipedia 
Jekyll is the engine behind GitHub Pages, a GitHub feature that allows users to host websites based on their GitHub repositories. Interesting spin with Jekyll Now to run it directly from GitHub.
Instead of using databases, Jekyll takes the content, renders Markdown or Textile (Textile (markup language)) and Liquid templates, and produces a complete, static website ready to be served by Apache HTTP Server, Nginx or another web server.
Jekyll is flexible and can be used in combination with front-end frameworks (Web application framework) such as Bootstrap (Bootstrap (front-end framework)),[ ] Semantic UI and many others.
Jekyll sites can be connected to cloud-based CMS software such as CloudCannon, Forestry, Netlify or Siteleaf, enabling content editors to modify site content without having to know how to code.
Jekyll is a simple, blog-aware, static site generator for personal, project, or organization sites. Written in Ruby by Tom Preston-Werner, GitHub's co-founder, it is distributed under an open source license - wikipedia