The best replacement for commercial software is open source.

The best alternatives to commercial software are rated as following:
★★★★★  open source
★★  open source software
★★  free software
★  custom software
★  freeware
★  shareware
★  open software
  foss

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Google Trends

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