Love how the inheritance works.
Number of pre-made component.
Makes use of pre-processors very easy. It can build most of the popular templating tools.
You don't have to worry about missing a dependency for your project.
A simple way to host your static sites.
Super easy to setup to have your prototypes deployed with CI.
Tons of free package available and most of all its from github so managing your repo is that easy.
Easy to understand and manipulate to display on your website.