Metalsmith - An extremely simple, pluggable static site generator.
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
Nikola - Nikola is s static site generator tool written in Python.
Grav - The modern open source flat-file CMS
GatsbyJS - Blazing-fast static site generator for React
Drupal - Drupal - the leading open-source CMS for ambitious digital experiences that reach your audience across multiple channels. Because we all have different needs, Drupal allows you to create a unique space in a world of cookie-cutter solutions.