The best replacement for curio is onenote.

The best alternatives to curio are rated as following:
★★★★★  onenote
★★★★  china cabinet
★★★★  devonthink
★★★★  tinderbox
★★★  omnigraffle
★★★  hush
★  mindnode
★  omnioutliner
★  growly notes
★  circus ponies
★  mindmanager
  china cabinets

Your alternative for curio is not listed? Suggest!
Speaking about curio, one probably shouldn't forget about hidden gun cabinet.

Other search terms related to curio and their ratings are:
★★★★★ hidden gun cabinet
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Google Trends

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curio
onenote
china cabinet