If I'm reading the docs correctly, the webserver part of Mojolicious is optional:
It also supports a pretty substantial list of alternatives to its build in web server. Want to only run it as a CGI script? Then do that. Run your app as a PSGI script? Yeah, you can do that too. Started as a CGI script by now need a lot more HP? Not so hard to move what you started on something simple to something with a little more Umph.
So that's I guess, "neat"