Contact form back end language

I'm in the process of developing a site and have hit a bit of a snag. I'm trying to decide the best way to go about hooking up a contact form.

I've got the front end built out using Bootstrap, but I'm having trouble deciding on how best to approach the back end. I keep coming across PHP as the way to go, but I'm not a huge fan of the syntax so I'd like to find a good alternative.

What are some alternatives to using PHP for the back end of a contact form?