The best replacement for gwt is jquery.

The best alternatives to gwt are rated as following:
★★★★★  jquery
★★★★  jsf
★★  flex
★★  vaadin
★★  dojo
★★  angularjs
★★  extjs
★★  wicket
★★  dart
★★  yui
★  gxt
★  grails
★  jsp
★  smartgwt
  struts
  rails
  swt
  zk
  rap
  gwt
  spring mvc
  closure

Your alternative for gwt is not listed? Suggest!
Speaking about gwt, one probably shouldn't forget about spring.

Other search terms related to gwt and their ratings are:
★★★★★ spring
★★★★ jquery
★★★ spring mvc
★★★ app engine
★★ rpc
You have in mind a companion for gwt and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gwt in all years. Click on graph for more.
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