The best replacement for o-pap is npap.

The best alternatives to o-pap are rated as following:
★★★★★  npap
★★★  wasr
★  n-pap

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No companions for o-pap have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of o-pap in all years. Click on graph for more.
o-pap
npap
wasr