The best replacement for octabox is softbox.

The best alternatives to octabox are rated as following:
★★★★★  softbox
★★★  beauty dish
★★★  plm
★★  umbrella
★  rectangular softbox
★  square softbox
  softlighter
  deep octabox
  soft box

Your alternative for octabox is not listed? Suggest!
Speaking about octabox, one probably shouldn't forget about alien bee.

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



Google Trends

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octabox
softbox
beauty dish