What are some alternatives?
When comparing Assemble and Jekyll, you can also consider the following products
GatsbyJS - Blazing-fast static site generator for React
Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.
Wintersmith - Flexible, minimalistic, multi-platform static site generator built on top of node.js
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.
Metalsmith - An extremely simple, pluggable static site generator.
Hugo - Hugo is a general-purpose website framework for generating static web pages.