The best replacement for loadrunner is winrunner.

The best alternatives to loadrunner are rated as following:
★★★★★  winrunner
★★★★★  jmeter
★★★  performance center
★★★  qtp
★★★  silkperformer
★★  rational performance tester
★★  selenium
★★  neoload
★★  loadui
★  soasta
★  soapui
★  vsts
★  webload
★  performance tester
  rpt
  qaload
  vugen
  grinder

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

Other search terms related to loadrunner and their ratings are:
★★★★★ citrix
★★★ qtp
★★ documentum
★★ qtp scripts
You have in mind a companion for loadrunner and it is not yet here? Propose!



Google Trends

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loadrunner
winrunner
jmeter