Jekyll is a static website generator that includes support for common blog features, such as post categories and permalinks. It takes a folder of text files written in a lightweight markup language and renders these to HTML, CSS, and Javascript. Out of the box, Jekyll understands Markdown, Textile, and Liquid markup. Support for other formats (e.g., ReStructuredText) are available as plugins. The created sites can be hosted using any generic hosting service and do not require any special software on the web server to work. Jekyll is also the software that powers the GitHub Pages hosting service, which can be used to deploy Jekyll-generated sites for free. Jekyll requires a Ruby interpreter to run. Apple includes Ruby with macOS and installers are available for Windows and most UNIX-like operating systems.