It is running Anchor. It's a neat system, no thrills and easy to hack in changes. I managed to get it how I wanted pretty quickly. It is starting to feel a bit like abandonware though, which is bad. My only concern is its use of SQL, not something I'm a massive fan of, as it is a personal small site I would prefer something more flat. The backend PHP code is pretty easy to understand and alter, I would say take a look before installing. It might be for you, might not. It's clean and uses nothing fancy.