This site runs on my own custom-built CMS, which I call Argon.
Argon is a lightweight CMS intended to give PHP developers flexibility to make quick, beautiful websites on the fly. Under the hood, Argon uses object-oriented PHP and has the capability to link into a variety of database types, and on the surface, Argon uses Bootstrap and FontAwesome for displaying and organizing page content.
I started working on Argon in October 2012, and the project is in active development. I hope to release it under a GNU-GPL in the near future.