Linode Web Site programming Language (and framework)

I'm really curious and I began to look for hints that indicate the programming language that the Linode website is developed (or a Framework like Yii, Django, etc.), obviously this was an unsuccessful search.

I want to highlight the coolness (if that's a word) of the Linode website and want to know what language and framework was used to do that. I don't know if that is a secret or something like that but i would really appreciate the information. That page is an example to me.

Thanks in advance :D