There's loads of languages to choose from. Python, PHP, Perl, Ruby, etc. Typically, any language can be used if your server has CGI support, which extremely com

There's loads of languages to choose from. Python, PHP, Perl, Ruby, etc. Typically, any language can be used if your server has CGI support, which extremely common, or if it has a module for your desired language. Hell, from reading his essays, Paul Graham says you can use anything you want, like he and the Viaweb team used Lisp, providing you run your own server.