The best replacement for gpp is gpo.

The best alternatives to gpp are rated as following:
★★★★★  gpo
★★★★★  r sim
★★★★★  npp
★★★★  gevey
★★★  gap
★★★  g++
★★★  stakeholder
★★  nest
★★  spp
★  r sim 8
  falwok
  rsim
  gevey sim

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Google Trends

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gpp
gpo
r sim