The best replacement for robohelp is flare.

The best alternatives to robohelp are rated as following:
★★★★★  flare
★★  framemaker
★★  webworks
★  help and manual
★  madcap
★  doc to help
★  doc-to-help
  madcap flare
  robohtml
  helpndoc

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

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



Google Trends

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robohelp
flare
framemaker