The best replacement for jbpm is drools.

The best alternatives to jbpm are rated as following:
★★★★★  drools
★★★★★  activiti
★★★  bpel
★★★  ibm bpm
★★  brms
★★  processmaker
★★  pega
★★  oracle bpm
★★  intalio
★★  osworkflow
★  ode
★  camunda
★  riftsaw
★  openwfe
★  bonita
★  lombardi
★  windows workflow foundation
  iprocess
  drools flow

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Speaking about jbpm, one probably shouldn't forget about drools.

Other search terms related to jbpm and their ratings are:
★★★★★ drools
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