Dropwizard has support for front-end development, but I think it really shines when developing RESTful API endpoints. You can use it to serve static assets, and those can be automatically "deployed" by refreshing the page, because Dropwizard just wires up Jetty to grab files off of the hard drive. If you want to use Freemaker/Mustache for views, I don't think it currently supports any "live" development.

It really works much better when creating a REST API for access by apps or separate front-ends (e.g. a JS SPA).