check: Technology Radar ; JANUARY 2015 ( by the ThoughtWorks Technology Advisory Board )
http://www.thoughtworks.com/radar/languages-and-frameworks
http://www.thoughtworks.com/radar/tools
http://www.thoughtworks.com/radar/languages-and-frameworks
http://www.thoughtworks.com/radar/tools
However, if you don't already know Rails or Grails (or possibly Django), then that is a good place to start.