The best replacement for primefaces is richfaces.

The best alternatives to primefaces are rated as following:
★★★★★  richfaces
★★★★★  icefaces
★★★  myfaces
★★★  adf
★★  primeui
★  vaadin
  zk

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

Other search terms related to primefaces and their ratings are:
★★★★★ jsf
★★★★★ spring webflow
★★★★ myfaces
★★★ omnifaces
★ richfaces
★ jsf 1.2
You have in mind a companion for primefaces and it is not yet here? Propose!



Google Trends

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primefaces
richfaces
icefaces