The best replacement for omnioutliner is scrivener.

The best alternatives to omnioutliner are rated as following:
★★★★★  scrivener
★★★★  omnifocus
★★★  omniplan
★★★  devonthink
★★★  circus ponies notebook
★★  workflowy
★  circus ponies
★  taskpaper
  curio

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omnioutliner
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