The best replacement for open source software is proprietary software.

The best alternatives to open source software are rated as following:
★★★★★  proprietary software
★★★  commercial software
★★★  closed source software
★★★  free software
★★  freeware
★  closed source
★  proprietary
  software
  close source software
  proprietor software
  free source software

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Google Trends

Scale is based on the average worldwide traffic of open source software in all years. Click on graph for more.
open source software
proprietary software
commercial software