The best replacement for intranet is internet.

The best alternatives to intranet are rated as following:
★★★★★  internet
★★★★  extranet
★★  lan
★★  portal
★  intranet
★  sharepoint
★  robotica
★  internet difference
  trusted sites
  internet definition
  client server
  an extranet

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Google Trends

Scale is based on the average worldwide traffic of intranet in all years. Click on graph for more.