Soushi (草紙 in Japanese) is a bimodal site generator powered by PHP.
In what way is Soushi bimodal?
Soushi is bimodal in terms of that it supports both generating a static Web site for GitHub Pages and serving contents dynamically via PHP scripts which can be simply put onto Web server, making HTML files from source files written in Markdown.
Soushi exploits the strength of PHP which allows us to easily deploy scripts and which is, itself, a template language, being enhanced by Plates library.
See http://kentarok.org/soushi/ for documentation. Which is also a live example of Soushi.