The best replacement for esb is soa.

The best alternatives to esb are rated as following:
★★★★★  soa
★★★★  eai
★★★★  etl
★★★★  ipa
★★★  bpel
★★★  bpm
★★  message broker
★★  jms
★★  message bus
★  api management
★  camel
★  integration framework
★  airtricity
★  hub and spoke
  application server
  spring integration
  top of the rock
  biztalk
  pale ale
  not to esb
  bpel oracle
  osb
  web services
  middleware
  mq
  rotj
  mule
  uddi

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

Other search terms related to esb and their ratings are:
★★★★★ biztalk
★★★★ soa
★ bpm
You have in mind a companion for esb and it is not yet here? Propose!



Google Trends

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