Updated 03/20/2020: moved to Netlify to use Netlify CMS.
Everything you need to install and run Jekyll on your Mac are absolute free: Ruby and Jekyll itself. When deploying it onto the Internet, look no further: Github.io
Jekyll’s core is run by Ruby in realtime so it generate statistic HTML pages from your markdown text files. Thus, this is a lightning fast comparing to any other dynamic languages.
Github’s servers itself use content delivery network (CDN) to ‘clone’ your website to so many geography server locations within its network. When a person views your website, data from the closest server will be served