The best replacement for jetty is tomcat.

The best alternatives to jetty are rated as following:
★★★★★  tomcat
★★★  glassfish
★★★  netty
★★  groin
★★  jboss
★★  pier
★  nginx
★  grizzly
★  resin
★  dock
★  wharf
★  breakwater
★  tomcat solr
  getty
  weblogic
  tomcat performance
  quay
  http-kit
  winstone

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

Other search terms related to jetty and their ratings are:
★★★★★ jersey
★★★★ intellij
★★ cxf
★ jboss
You have in mind a companion for jetty and it is not yet here? Propose!



Google Trends

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