The best replacement for struts2 is spring mvc.

The best alternatives to struts2 are rated as following:
★★★★★  spring mvc
★★★★  jsf
★★★★  struts1
★★  struts
★  grails
★  struts1 differences
★  struts 1.2
★  spring 3
  jsf 2
  vaadin
  struts 1

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Speaking about struts2, one probably shouldn't forget about jquery tutorial.

Other search terms related to struts2 and their ratings are:
★★★★★ jquery tutorial
★★★★★ tiles example
★★ html5
★ jquery grid example
★ action class
★ hibernate tutorial
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You have in mind a companion for struts2 and it is not yet here? Propose!



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